feat: turbostarter boilerplate

Production-ready Next.js boilerplate with:
- Runtime env validation (fail-fast on missing vars)
- Feature-gated config (S3, Stripe, email, OAuth)
- Docker + Coolify deployment pipeline
- PostgreSQL + pgvector, MinIO S3, Better Auth
- TypeScript strict mode (no ignoreBuildErrors)
- i18n (en/es), AI modules, billing, monitoring

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/cognitive-context/bin/cognitive.js

@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+import { run } from '../dist/cli.js';
+run();

packages/cognitive-context/package.json

@@ -0,0 +1,46 @@
+{
+  "name": "@repo/cognitive-context",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Production-ready context management system for AI coding assistants",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "bin": {
+    "cognitive": "./bin/cognitive.js"
+  },
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "chokidar": "^3.5.3",
+    "commander": "^11.1.0",
+    "js-tiktoken": "^1.0.8",
+    "yaml": "^2.3.4",
+    "zod": "^3.22.4"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "typescript": "^5.7.2",
+    "vitest": "^2.1.8"
+  },
+  "keywords": [
+    "ai",
+    "context",
+    "cursor",
+    "claude",
+    "coding-assistant",
+    "developer-tools"
+  ],
+  "license": "MIT"
+}

packages/cognitive-context/src/adapters/claude.ts

@@ -0,0 +1,186 @@
+/**
+ * Claude Code Adapter
+ *
+ * Standalone interface for Claude Code-specific operations.
+ * Generates CLAUDE.md and syncs commands to .claude/commands/.
+ */
+
+import { writeFile, mkdir, rm, readdir } from 'node:fs/promises';
+import { join, dirname } from 'node:path';
+import { stringify as stringifyYaml } from 'yaml';
+import { loadKnowledge, type KnowledgeData, type SyncOptions } from '../sync.js';
+import type { SyncResult } from '../types.js';
+
+// ============================================
+// Types
+// ============================================
+
+/** Options for generating CLAUDE.md content */
+export interface ClaudeMdOptions {
+  includeCapabilities?: boolean;
+  includeRules?: boolean;
+  includeWisdom?: boolean;
+  headerContent?: string;
+  footerContent?: string;
+}
+
+/** Structure of generated CLAUDE.md */
+export interface ClaudeMdStructure {
+  projectName: string;
+  mainContent: string;
+  capabilities?: string;
+  rules?: string;
+  wisdomRefs?: Array<{ name: string; heading: string }>;
+}
+
+/** Options for syncing commands */
+export interface SyncCommandsOptions extends SyncOptions {
+  deleteStale?: boolean;
+}
+
+// ============================================
+// Utilities
+// ============================================
+
+function extractFirstHeading(content: string): string {
+  const match = content.match(/^#\s+(.+)$/m);
+  return match ? match[1].trim() : 'Untitled';
+}
+
+async function ensureDir(dirPath: string): Promise<void> {
+  await mkdir(dirPath, { recursive: true });
+}
+
+// ============================================
+// CLAUDE.md Generation
+// ============================================
+
+/** Generate CLAUDE.md content from knowledge data */
+export function generateClaudeMd(
+  knowledge: KnowledgeData,
+  options: ClaudeMdOptions = {}
+): string {
+  const {
+    includeCapabilities = true,
+    includeRules = true,
+    includeWisdom = true,
+    headerContent,
+    footerContent,
+  } = options;
+
+  const sections: string[] = [];
+
+  if (headerContent) sections.push(headerContent, '');
+  sections.push(`# ${knowledge.projectName}`, '');
+  if (knowledge.orientation || knowledge.summary) {
+    sections.push(knowledge.orientation || knowledge.summary, '');
+  }
+
+  if (includeCapabilities && Object.keys(knowledge.capabilities).length > 0) {
+    sections.push('## Capabilities', '', '```yaml', stringifyYaml(knowledge.capabilities).trim(), '```', '');
+  }
+
+  if (includeRules && Object.keys(knowledge.rules).length > 0) {
+    sections.push('## Rules', '', '```yaml', stringifyYaml(knowledge.rules).trim(), '```', '');
+  }
+
+  if (includeWisdom && knowledge.wisdom.size > 0) {
+    sections.push('## Wisdom', '', 'Cached patterns and answers:', '');
+    for (const [name, content] of knowledge.wisdom) {
+      sections.push(`- **${name}**: ${extractFirstHeading(content)}`);
+    }
+    sections.push('');
+  }
+
+  if (footerContent) sections.push(footerContent, '');
+  return sections.join('\n');
+}
+
+// ============================================
+// Commands Sync
+// ============================================
+
+/** Sync commands to .claude/commands/ directory */
+export async function syncCommands(
+  projectRoot: string,
+  commands: Map<string, string>,
+  options: SyncCommandsOptions = {}
+): Promise<SyncResult> {
+  const commandsDir = join(projectRoot, '.claude', 'commands');
+  const filesWritten: string[] = [];
+  const filesDeleted: string[] = [];
+
+  try {
+    if (!options.dryRun) await ensureDir(commandsDir);
+    const currentCommands = new Set<string>();
+
+    for (const [name, content] of commands) {
+      const fileName = `${name}.md`;
+      currentCommands.add(fileName);
+      const commandPath = join(commandsDir, fileName);
+      if (!options.dryRun) {
+        await ensureDir(dirname(commandPath));
+        await writeFile(commandPath, content, 'utf-8');
+      }
+      filesWritten.push(commandPath);
+    }
+
+    if (options.deleteStale !== false) {
+      try {
+        const entries = await readdir(commandsDir, { withFileTypes: true });
+        for (const entry of entries) {
+          if (entry.isFile() && entry.name.endsWith('.md') && !currentCommands.has(entry.name)) {
+            const filePath = join(commandsDir, entry.name);
+            if (!options.dryRun) await rm(filePath);
+            filesDeleted.push(filePath);
+          }
+        }
+      } catch { /* Directory doesn't exist */ }
+    }
+
+    return { tool: 'claude', filesWritten, filesDeleted, success: true };
+  } catch (error) {
+    return { tool: 'claude', filesWritten, filesDeleted, success: false, error: error instanceof Error ? error.message : String(error) };
+  }
+}
+
+// ============================================
+// Full Sync
+// ============================================
+
+/** Full sync to Claude Code format (CLAUDE.md + .claude/commands/) */
+export async function syncToClaudeCode(
+  projectRoot: string,
+  options: SyncOptions & ClaudeMdOptions = {}
+): Promise<SyncResult> {
+  const filesWritten: string[] = [];
+  const filesDeleted: string[] = [];
+
+  try {
+    const knowledge = await loadKnowledge(projectRoot);
+
+    if (knowledge.summary || knowledge.orientation) {
+      const claudeMdPath = join(projectRoot, 'CLAUDE.md');
+      if (!options.dryRun) await writeFile(claudeMdPath, generateClaudeMd(knowledge, options), 'utf-8');
+      filesWritten.push(claudeMdPath);
+    }
+
+    if (knowledge.commands.size > 0) {
+      const result = await syncCommands(projectRoot, knowledge.commands, options);
+      filesWritten.push(...result.filesWritten);
+      filesDeleted.push(...result.filesDeleted);
+      if (!result.success) return { tool: 'claude', filesWritten, filesDeleted, success: false, error: result.error };
+    }
+
+    return { tool: 'claude', filesWritten, filesDeleted, success: true };
+  } catch (error) {
+    return { tool: 'claude', filesWritten, filesDeleted, success: false, error: error instanceof Error ? error.message : String(error) };
+  }
+}
+
+// ============================================
+// Re-exports
+// ============================================
+
+export { loadKnowledge, type KnowledgeData, type SyncOptions } from '../sync.js';
+export type { SyncResult } from '../types.js';

packages/cognitive-context/src/adapters/cursor.ts

@@ -0,0 +1,299 @@
+/**
+ * Cursor Adapter Module
+ *
+ * Provides a standalone interface for Cursor-specific operations.
+ * Generates and manages .mdc files in .cursor/rules/.
+ */
+
+import { readdir, stat } from 'node:fs/promises';
+import { join } from 'node:path';
+import {
+  loadKnowledge,
+  syncToTool,
+  type SyncOptions,
+  type KnowledgeData,
+} from '../sync.js';
+import type { SyncResult, ToolConfig } from '../types.js';
+
+// ============================================
+// Types
+// ============================================
+
+/**
+ * Options for generating an MDC file
+ */
+export interface MdcFileOptions {
+  /** Description for the frontmatter */
+  description: string;
+  /** If true, rule always applies to all files */
+  alwaysApply?: boolean;
+  /** Glob patterns for files this rule applies to (optional) */
+  globs?: string[];
+}
+
+/**
+ * Structure of a generated MDC file
+ */
+export interface MdcFile {
+  /** File name (without path) */
+  name: string;
+  /** Full MDC content including frontmatter */
+  content: string;
+  /** Parsed frontmatter */
+  frontmatter: MdcFrontmatter;
+}
+
+/**
+ * MDC frontmatter structure
+ */
+export interface MdcFrontmatter {
+  description: string;
+  alwaysApply?: boolean;
+  globs?: string[];
+}
+
+/**
+ * Validation result for rules directory
+ */
+export interface RulesValidation {
+  /** Whether the rules directory exists */
+  exists: boolean;
+  /** List of .mdc files found */
+  files: string[];
+  /** List of issues found */
+  issues: ValidationIssue[];
+  /** Overall validity */
+  valid: boolean;
+}
+
+/**
+ * Individual validation issue
+ */
+export interface ValidationIssue {
+  file: string;
+  type: 'missing-frontmatter' | 'invalid-frontmatter' | 'empty-content';
+  message: string;
+}
+
+// ============================================
+// Constants
+// ============================================
+
+const DEFAULT_RULES_PATH = '.cursor/rules';
+
+// ============================================
+// MDC File Generation
+// ============================================
+
+/**
+ * Generate MDC frontmatter string
+ */
+function formatMdcFrontmatter(options: MdcFileOptions): string {
+  const lines = ['---', `description: ${options.description}`];
+
+  if (options.alwaysApply) {
+    lines.push('alwaysApply: true');
+  }
+
+  if (options.globs && options.globs.length > 0) {
+    lines.push('globs:');
+    for (const glob of options.globs) {
+      lines.push(`  - ${glob}`);
+    }
+  }
+
+  lines.push('---', '');
+  return lines.join('\n');
+}
+
+/**
+ * Generate a single .mdc file content
+ *
+ * @param name - File name (without .mdc extension)
+ * @param content - Markdown content (without frontmatter)
+ * @param options - MDC file options
+ * @returns Complete MDC file structure
+ */
+export function generateMdcFile(
+  name: string,
+  content: string,
+  options: MdcFileOptions
+): MdcFile {
+  const frontmatter = formatMdcFrontmatter(options);
+  const fullContent = frontmatter + content;
+
+  return {
+    name: name.endsWith('.mdc') ? name : `${name}.mdc`,
+    content: fullContent,
+    frontmatter: {
+      description: options.description,
+      alwaysApply: options.alwaysApply,
+      globs: options.globs,
+    },
+  };
+}
+
+// ============================================
+// Sync Operations
+// ============================================
+
+/**
+ * Sync cognitive knowledge to .cursor/rules
+ *
+ * @param projectRoot - Project root directory
+ * @param options - Sync options
+ * @returns Sync result
+ */
+export async function syncToRules(
+  projectRoot: string,
+  options: SyncOptions = {}
+): Promise<SyncResult> {
+  const knowledge = await loadKnowledge(projectRoot);
+
+  const toolConfig: ToolConfig = {
+    name: 'cursor',
+    enabled: true,
+    outputPath: DEFAULT_RULES_PATH,
+  };
+
+  return syncToTool('cursor', projectRoot, toolConfig, knowledge, options);
+}
+
+/**
+ * Sync with pre-loaded knowledge data
+ *
+ * @param projectRoot - Project root directory
+ * @param knowledge - Pre-loaded knowledge data
+ * @param options - Sync options
+ * @returns Sync result
+ */
+export async function syncToRulesWithKnowledge(
+  projectRoot: string,
+  knowledge: KnowledgeData,
+  options: SyncOptions = {}
+): Promise<SyncResult> {
+  const toolConfig: ToolConfig = {
+    name: 'cursor',
+    enabled: true,
+    outputPath: DEFAULT_RULES_PATH,
+  };
+
+  return syncToTool('cursor', projectRoot, toolConfig, knowledge, options);
+}
+
+// ============================================
+// Validation
+// ============================================
+
+/**
+ * Validate the .cursor/rules directory
+ *
+ * Checks for:
+ * - Directory existence
+ * - Valid .mdc files with proper frontmatter
+ * - Non-empty content
+ *
+ * @param projectRoot - Project root directory
+ * @returns Validation result
+ */
+export async function validateRules(
+  projectRoot: string
+): Promise<RulesValidation> {
+  const rulesDir = join(projectRoot, DEFAULT_RULES_PATH);
+  const issues: ValidationIssue[] = [];
+  const files: string[] = [];
+
+  // Check if directory exists
+  try {
+    const stats = await stat(rulesDir);
+    if (!stats.isDirectory()) {
+      return {
+        exists: false,
+        files: [],
+        issues: [
+          {
+            file: rulesDir,
+            type: 'missing-frontmatter',
+            message: 'Rules path exists but is not a directory',
+          },
+        ],
+        valid: false,
+      };
+    }
+  } catch {
+    return {
+      exists: false,
+      files: [],
+      issues: [],
+      valid: true, // Not existing is valid (just means no rules yet)
+    };
+  }
+
+  // List .mdc files
+  try {
+    const entries = await readdir(rulesDir, { withFileTypes: true });
+
+    for (const entry of entries) {
+      if (entry.isFile() && entry.name.endsWith('.mdc')) {
+        files.push(entry.name);
+
+        // Read and validate file
+        const filePath = join(rulesDir, entry.name);
+        const { readFile } = await import('node:fs/promises');
+        const content = await readFile(filePath, 'utf-8');
+
+        // Check for frontmatter
+        if (!content.startsWith('---')) {
+          issues.push({
+            file: entry.name,
+            type: 'missing-frontmatter',
+            message: 'File does not start with YAML frontmatter (---)',
+          });
+          continue;
+        }
+
+        // Check for closing frontmatter
+        const secondDash = content.indexOf('---', 3);
+        if (secondDash === -1) {
+          issues.push({
+            file: entry.name,
+            type: 'invalid-frontmatter',
+            message: 'Frontmatter is not properly closed',
+          });
+          continue;
+        }
+
+        // Check for content after frontmatter
+        const bodyContent = content.slice(secondDash + 3).trim();
+        if (!bodyContent) {
+          issues.push({
+            file: entry.name,
+            type: 'empty-content',
+            message: 'File has no content after frontmatter',
+          });
+        }
+      }
+    }
+  } catch (error) {
+    issues.push({
+      file: rulesDir,
+      type: 'invalid-frontmatter',
+      message: `Failed to read rules directory: ${error instanceof Error ? error.message : String(error)}`,
+    });
+  }
+
+  return {
+    exists: true,
+    files,
+    issues,
+    valid: issues.length === 0,
+  };
+}
+
+// ============================================
+// Re-exports
+// ============================================
+
+// Re-export sync types for convenience
+export type { SyncOptions, KnowledgeData } from '../sync.js';
+export type { SyncResult, ToolConfig } from '../types.js';

packages/cognitive-context/src/adapters/index.ts

@@ -0,0 +1,8 @@
+/**
+ * Tool-specific adapters for Cognitive Context
+ *
+ * @packageDocumentation
+ */
+
+export * from './cursor.js';
+export * from './claude.js';

packages/cognitive-context/src/cli.ts

@@ -0,0 +1,743 @@
+#!/usr/bin/env node
+/**
+ * CLI Interface for Cognitive Context
+ *
+ * Provides commands for managing cognitive context:
+ * - init: Initialize cognitive.config.yaml
+ * - extract: Extract entities from source code
+ * - validate: Validate context completeness
+ * - drift: Check for context drift
+ * - sync: Sync context to enabled tools
+ * - watch: Watch for changes and auto-sync
+ * - status: Show current context status
+ * - hook: Manage git pre-commit hook
+ */
+
+import { Command } from 'commander';
+import { resolve, relative, join } from 'node:path';
+import { readFile, writeFile, mkdir, access } from 'node:fs/promises';
+
+// Core modules
+import { initConfig, loadConfig, loadConfigOrDefault, ConfigNotFoundError } from './config.js';
+import { extractEntitiesFromDir, type ExtractOptions } from './extractor.js';
+import { validateCapabilitiesFile, formatValidationResult, hasValidationIssues } from './validator.js';
+import { detectDrift, formatDriftSummary, hasChanges as hasDriftChanges } from './drift.js';
+import { syncAll, loadKnowledge, getSupportedTools } from './sync.js';
+import { createWatcher } from './watcher.js';
+import { countTokens, formatTokenCount } from './tokens.js';
+import { installHook, uninstallHook, runPreCommitCheck, formatPreCommitOutput } from './hooks/pre-commit.js';
+import type { KnowledgeGraph, ExtractedEntity } from './types.js';
+
+// ============================================
+// Constants
+// ============================================
+
+const VERSION = '0.1.0';
+const COGNITIVE_DIR = '.cognitive';
+const KNOWLEDGE_FILE = 'knowledge.json';
+const CAPABILITIES_FILE = 'capabilities.yaml';
+
+// ANSI color codes (inline to avoid external dependency)
+const colors = {
+  reset: '\x1b[0m',
+  bold: '\x1b[1m',
+  dim: '\x1b[2m',
+  red: '\x1b[31m',
+  green: '\x1b[32m',
+  yellow: '\x1b[33m',
+  blue: '\x1b[34m',
+  magenta: '\x1b[35m',
+  cyan: '\x1b[36m',
+};
+
+// ============================================
+// Output Helpers
+// ============================================
+
+function c(color: keyof typeof colors, text: string): string {
+  return `${colors[color]}${text}${colors.reset}`;
+}
+
+function success(message: string): void {
+  console.log(`${c('green', '✓')} ${message}`);
+}
+
+function error(message: string): void {
+  console.error(`${c('red', '✗')} ${message}`);
+}
+
+function warn(message: string): void {
+  console.warn(`${c('yellow', '!')} ${message}`);
+}
+
+function info(message: string): void {
+  console.log(`${c('blue', 'i')} ${message}`);
+}
+
+function heading(title: string): void {
+  console.log(`\n${c('bold', title)}`);
+  console.log(c('dim', '─'.repeat(title.length)));
+}
+
+function bullet(text: string, indent: number = 0): void {
+  console.log(`${'  '.repeat(indent)}${c('dim', '•')} ${text}`);
+}
+
+// ============================================
+// Helper Functions
+// ============================================
+
+async function fileExists(path: string): Promise<boolean> {
+  try {
+    await access(path);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+async function loadSavedGraph(projectRoot: string): Promise<KnowledgeGraph | null> {
+  try {
+    const graphPath = join(projectRoot, COGNITIVE_DIR, KNOWLEDGE_FILE);
+    const content = await readFile(graphPath, 'utf-8');
+    return JSON.parse(content) as KnowledgeGraph;
+  } catch {
+    return null;
+  }
+}
+
+async function saveGraph(projectRoot: string, graph: KnowledgeGraph): Promise<void> {
+  const cognitiveDir = join(projectRoot, COGNITIVE_DIR);
+  await mkdir(cognitiveDir, { recursive: true });
+  const graphPath = join(cognitiveDir, KNOWLEDGE_FILE);
+  await writeFile(graphPath, JSON.stringify(graph, null, 2), 'utf-8');
+}
+
+function buildKnowledgeGraph(
+  entities: ExtractedEntity[],
+  projectRoot: string,
+  commit: string = 'unknown'
+): KnowledgeGraph {
+  const entitiesMap: Record<string, ExtractedEntity> = {};
+
+  for (const entity of entities) {
+    // Use path as key for uniqueness
+    entitiesMap[entity.path] = entity;
+  }
+
+  return {
+    meta: {
+      generatedAt: new Date().toISOString(),
+      fromCommit: commit,
+      totalEntities: entities.length,
+      projectRoot,
+      version: VERSION,
+    },
+    entities: entitiesMap,
+    relationships: [], // Build relationships from imports
+  };
+}
+
+async function getGitCommit(projectRoot: string): Promise<string> {
+  try {
+    const { execSync } = await import('node:child_process');
+    const commit = execSync('git rev-parse --short HEAD', {
+      cwd: projectRoot,
+      encoding: 'utf-8',
+    }).trim();
+    return commit;
+  } catch {
+    return 'unknown';
+  }
+}
+
+// ============================================
+// Command Implementations
+// ============================================
+
+async function cmdInit(_options: { config?: string; verbose?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    // Check if config already exists
+    try {
+      await loadConfig(projectRoot);
+      error('Configuration already exists. Remove existing config to reinitialize.');
+      process.exit(1);
+    } catch (e) {
+      if (!(e instanceof ConfigNotFoundError)) {
+        throw e;
+      }
+    }
+
+    const configPath = await initConfig(projectRoot);
+    success(`Created ${c('cyan', relative(projectRoot, configPath))}`);
+
+    // Create .cognitive directory
+    const cognitiveDir = join(projectRoot, COGNITIVE_DIR);
+    await mkdir(cognitiveDir, { recursive: true });
+    success(`Created ${c('cyan', COGNITIVE_DIR + '/')} directory`);
+
+    info('Next steps:');
+    bullet('Run `cognitive extract` to scan your codebase');
+    bullet('Run `cognitive sync` to generate tool-specific files');
+
+  } catch (err) {
+    error(`Failed to initialize: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdExtract(options: { config?: string; verbose?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    const config = await loadConfigOrDefault(projectRoot);
+
+    heading('Extracting entities');
+
+    const extractOptions: ExtractOptions = {
+      include: config.includePatterns,
+      exclude: config.excludePatterns,
+    };
+
+    let allEntities: ExtractedEntity[] = [];
+
+    for (const dir of config.sourceDirs) {
+      const sourceDir = resolve(projectRoot, dir);
+      if (!(await fileExists(sourceDir))) {
+        if (options.verbose) {
+          warn(`Skipping non-existent directory: ${dir}`);
+        }
+        continue;
+      }
+
+      const entities = await extractEntitiesFromDir(sourceDir, extractOptions);
+      if (options.verbose) {
+        info(`${dir}: Found ${entities.length} entities`);
+      }
+      allEntities = allEntities.concat(entities);
+    }
+
+    if (allEntities.length === 0) {
+      warn('No entities found. Check your sourceDirs and patterns in config.');
+      return;
+    }
+
+    // Build and save knowledge graph
+    const commit = await getGitCommit(projectRoot);
+    const graph = buildKnowledgeGraph(allEntities, projectRoot, commit);
+    await saveGraph(projectRoot, graph);
+
+    // Summary by type
+    const byType = new Map<string, number>();
+    for (const entity of allEntities) {
+      byType.set(entity.type, (byType.get(entity.type) || 0) + 1);
+    }
+
+    success(`Extracted ${c('bold', String(allEntities.length))} entities`);
+
+    for (const [type, count] of byType) {
+      bullet(`${type}: ${count}`, 1);
+    }
+
+    info(`Knowledge graph saved to ${c('cyan', COGNITIVE_DIR + '/' + KNOWLEDGE_FILE)}`);
+
+  } catch (err) {
+    error(`Extraction failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdValidate(_options: { config?: string; verbose?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    const savedGraph = await loadSavedGraph(projectRoot);
+
+    if (!savedGraph) {
+      warn('No knowledge graph found. Run `cognitive extract` first.');
+      process.exit(1);
+    }
+
+    heading('Validating context completeness');
+
+    const capabilitiesPath = join(projectRoot, COGNITIVE_DIR, CAPABILITIES_FILE);
+
+    if (!(await fileExists(capabilitiesPath))) {
+      warn(`No ${CAPABILITIES_FILE} found. Create one to validate against.`);
+      info('Tip: Define your project capabilities in .cognitive/capabilities.yaml');
+      return;
+    }
+
+    const result = await validateCapabilitiesFile(capabilitiesPath, savedGraph);
+
+    console.log('');
+    console.log(formatValidationResult(result));
+
+    if (hasValidationIssues(result)) {
+      process.exit(1);
+    }
+
+    success('Validation passed!');
+
+  } catch (err) {
+    error(`Validation failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdDrift(_options: { config?: string; verbose?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    const config = await loadConfigOrDefault(projectRoot);
+    const savedGraph = await loadSavedGraph(projectRoot);
+
+    if (!savedGraph) {
+      info('No previous knowledge graph found. Run `cognitive extract` to create one.');
+      return;
+    }
+
+    heading('Checking for drift');
+
+    // Re-extract current state
+    const extractOptions: ExtractOptions = {
+      include: config.includePatterns,
+      exclude: config.excludePatterns,
+    };
+
+    let currentEntities: ExtractedEntity[] = [];
+
+    for (const dir of config.sourceDirs) {
+      const sourceDir = resolve(projectRoot, dir);
+      if (await fileExists(sourceDir)) {
+        const entities = await extractEntitiesFromDir(sourceDir, extractOptions);
+        currentEntities = currentEntities.concat(entities);
+      }
+    }
+
+    const commit = await getGitCommit(projectRoot);
+    const currentGraph = buildKnowledgeGraph(currentEntities, projectRoot, commit);
+
+    const report = detectDrift(currentGraph, savedGraph);
+
+    console.log('');
+    console.log(formatDriftSummary(report));
+
+    if (hasDriftChanges(report)) {
+      warn('Drift detected! Consider running `cognitive extract && cognitive sync`');
+      process.exit(1);
+    }
+
+    success('No significant drift detected.');
+
+  } catch (err) {
+    error(`Drift check failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdSync(options: { config?: string; verbose?: boolean; dryRun?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    const config = await loadConfigOrDefault(projectRoot);
+
+    heading('Syncing to tools');
+
+    const enabledTools = config.tools.filter((t) => t.enabled);
+
+    if (enabledTools.length === 0) {
+      warn('No tools enabled. Enable tools in your cognitive.config.yaml');
+      info(`Supported tools: ${getSupportedTools().join(', ')}`);
+      return;
+    }
+
+    info(`Enabled tools: ${enabledTools.map((t) => t.name).join(', ')}`);
+
+    if (options.dryRun) {
+      info(c('yellow', 'Dry run mode - no files will be written'));
+    }
+
+    const toolConfigs = config.tools.map((t) => ({
+      name: t.name,
+      enabled: t.enabled,
+      outputPath: t.outputPath ?? '',
+    }));
+
+    const report = await syncAll(projectRoot, toolConfigs, {
+      dryRun: options.dryRun,
+      verbose: options.verbose,
+    });
+
+    console.log('');
+
+    for (const result of report.results) {
+      if (result.success) {
+        if (result.filesWritten.length > 0 || result.filesDeleted.length > 0) {
+          success(`${result.tool}: ${result.filesWritten.length} written, ${result.filesDeleted.length} deleted`);
+          if (options.verbose) {
+            for (const file of result.filesWritten) {
+              bullet(c('green', '+') + ' ' + relative(projectRoot, file), 1);
+            }
+            for (const file of result.filesDeleted) {
+              bullet(c('red', '-') + ' ' + relative(projectRoot, file), 1);
+            }
+          }
+        } else {
+          info(`${result.tool}: No changes needed`);
+        }
+      } else {
+        error(`${result.tool}: ${result.error}`);
+      }
+    }
+
+    console.log('');
+
+    if (report.allSuccessful) {
+      success(`Sync complete: ${report.totalFilesWritten} files written, ${report.totalFilesDeleted} deleted`);
+    } else {
+      warn('Sync completed with errors');
+      process.exit(1);
+    }
+
+  } catch (err) {
+    error(`Sync failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdWatch(options: { config?: string; verbose?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    const config = await loadConfigOrDefault(projectRoot);
+
+    heading('Watch mode');
+
+    const sourceDirs = config.sourceDirs.map((d) => resolve(projectRoot, d));
+
+    info(`Watching: ${config.sourceDirs.join(', ')}`);
+    info('Press Ctrl+C to stop');
+    console.log('');
+
+    let debounceTimer: ReturnType<typeof setTimeout> | null = null;
+    let pendingChanges = new Set<string>();
+
+    const handleSync = async () => {
+      if (pendingChanges.size === 0) return;
+
+      const changes = Array.from(pendingChanges);
+      pendingChanges.clear();
+
+      info(`Changes detected: ${changes.length} file(s)`);
+
+      // Re-extract and sync
+      const extractOptions: ExtractOptions = {
+        include: config.includePatterns,
+        exclude: config.excludePatterns,
+      };
+
+      let allEntities: ExtractedEntity[] = [];
+      for (const dir of sourceDirs) {
+        if (await fileExists(dir)) {
+          const entities = await extractEntitiesFromDir(dir, extractOptions);
+          allEntities = allEntities.concat(entities);
+        }
+      }
+
+      const commit = await getGitCommit(projectRoot);
+      const graph = buildKnowledgeGraph(allEntities, projectRoot, commit);
+      await saveGraph(projectRoot, graph);
+
+      const toolConfigs = config.tools.map((t) => ({
+        name: t.name,
+        enabled: t.enabled,
+        outputPath: t.outputPath ?? '',
+      }));
+
+      const report = await syncAll(projectRoot, toolConfigs, { verbose: options.verbose });
+
+      if (report.allSuccessful && report.totalFilesWritten > 0) {
+        success(`Synced ${report.totalFilesWritten} files`);
+      }
+    };
+
+    const watcher = createWatcher(
+      sourceDirs,
+      {
+        enabled: true,
+        debounceMs: config.watch.debounceMs,
+        ignorePaths: config.watch.ignorePaths,
+      },
+      {
+        onFileChange: (event) => {
+          pendingChanges.add(event.path);
+
+          if (debounceTimer) {
+            clearTimeout(debounceTimer);
+          }
+
+          debounceTimer = setTimeout(() => {
+            handleSync().catch((err) => {
+              error(`Sync failed: ${err instanceof Error ? err.message : String(err)}`);
+            });
+          }, config.watch.debounceMs);
+        },
+        onError: (err) => {
+          error(`Watch error: ${err.message}`);
+        },
+      }
+    );
+
+    watcher.start();
+
+    // Handle graceful shutdown
+    process.on('SIGINT', () => {
+      console.log('');
+      info('Stopping watch mode...');
+      watcher.stop();
+      process.exit(0);
+    });
+
+    // Keep the process running
+    await new Promise(() => {});
+
+  } catch (err) {
+    error(`Watch failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdStatus(_options: { config?: string; verbose?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    heading('Cognitive Context Status');
+
+    // Check for config
+    let hasConfig = false;
+    try {
+      await loadConfig(projectRoot);
+      hasConfig = true;
+      success('Configuration: Found');
+    } catch (e) {
+      if (e instanceof ConfigNotFoundError) {
+        warn('Configuration: Not found (run `cognitive init`)');
+      } else {
+        throw e;
+      }
+    }
+
+    // Check for knowledge graph
+    const savedGraph = await loadSavedGraph(projectRoot);
+    if (savedGraph) {
+      success(`Knowledge graph: ${savedGraph.meta.totalEntities} entities`);
+      bullet(`Generated: ${new Date(savedGraph.meta.generatedAt).toLocaleString()}`, 1);
+      bullet(`Commit: ${savedGraph.meta.fromCommit}`, 1);
+    } else {
+      warn('Knowledge graph: Not found (run `cognitive extract`)');
+    }
+
+    // Check for .cognitive directory
+    const cognitiveDir = join(projectRoot, COGNITIVE_DIR);
+    if (await fileExists(cognitiveDir)) {
+      success(`.cognitive/ directory: Found`);
+    } else {
+      warn(`.cognitive/ directory: Not found`);
+    }
+
+    // Check for knowledge files
+    const knowledge = await loadKnowledge(projectRoot);
+
+    console.log('');
+    info('Knowledge files:');
+
+    if (knowledge.summary) {
+      const tokens = countTokens(knowledge.summary);
+      bullet(`SUMMARY.md: ${formatTokenCount(tokens)} tokens`, 1);
+    } else {
+      bullet(c('dim', 'SUMMARY.md: Not found'), 1);
+    }
+
+    if (Object.keys(knowledge.capabilities).length > 0) {
+      bullet(`capabilities.yaml: ${Object.keys(knowledge.capabilities).length} top-level keys`, 1);
+    } else {
+      bullet(c('dim', 'capabilities.yaml: Not found'), 1);
+    }
+
+    if (knowledge.wisdom.size > 0) {
+      bullet(`Wisdom files: ${knowledge.wisdom.size}`, 1);
+    }
+
+    if (knowledge.commands.size > 0) {
+      bullet(`Commands: ${knowledge.commands.size}`, 1);
+    }
+
+    // Show enabled tools
+    if (hasConfig) {
+      const config = await loadConfigOrDefault(projectRoot);
+      const enabledTools = config.tools.filter((t) => t.enabled).map((t) => t.name);
+
+      console.log('');
+      info(`Enabled tools: ${enabledTools.length > 0 ? enabledTools.join(', ') : 'None'}`);
+    }
+
+    console.log('');
+
+  } catch (err) {
+    error(`Status check failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdHook(action: string, _options: { config?: string; verbose?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    switch (action) {
+      case 'install':
+        await installHook(projectRoot);
+        success('Pre-commit hook installed');
+        info('Hook will run `cognitive pre-commit` before each commit');
+        break;
+
+      case 'uninstall':
+        await uninstallHook(projectRoot);
+        success('Pre-commit hook uninstalled');
+        break;
+
+      default:
+        error(`Unknown action: ${action}. Use 'install' or 'uninstall'`);
+        process.exit(1);
+    }
+  } catch (err) {
+    error(`Hook ${action} failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+async function cmdPreCommit(options: { config?: string; verbose?: boolean; block?: boolean }): Promise<void> {
+  const projectRoot = process.cwd();
+
+  try {
+    const result = await runPreCommitCheck(projectRoot, {
+      blockOnStale: options.block,
+      verbose: options.verbose,
+    });
+
+    console.log(formatPreCommitOutput(result));
+
+    if (!result.passed) {
+      process.exit(1);
+    }
+  } catch (err) {
+    error(`Pre-commit check failed: ${err instanceof Error ? err.message : String(err)}`);
+    process.exit(1);
+  }
+}
+
+// ============================================
+// Program Factory
+// ============================================
+
+export function createProgram(): Command {
+  const program = new Command();
+
+  program
+    .name('cognitive')
+    .description('Cognitive Context System - AI coding assistant context management')
+    .version(VERSION)
+    .option('-c, --config <path>', 'Path to config file')
+    .option('-v, --verbose', 'Enable verbose output');
+
+  program
+    .command('init')
+    .description('Initialize cognitive.config.yaml in project')
+    .action(async () => {
+      const opts = program.opts();
+      await cmdInit(opts);
+    });
+
+  program
+    .command('extract')
+    .description('Extract entities from source code')
+    .action(async () => {
+      const opts = program.opts();
+      await cmdExtract(opts);
+    });
+
+  program
+    .command('validate')
+    .description('Validate context completeness')
+    .action(async () => {
+      const opts = program.opts();
+      await cmdValidate(opts);
+    });
+
+  program
+    .command('drift')
+    .description('Check for context drift')
+    .action(async () => {
+      const opts = program.opts();
+      await cmdDrift(opts);
+    });
+
+  program
+    .command('sync')
+    .description('Sync context to enabled tools')
+    .option('-n, --dry-run', 'Show what would be done without making changes')
+    .action(async (cmdOpts) => {
+      const opts = { ...program.opts(), ...cmdOpts };
+      await cmdSync(opts);
+    });
+
+  program
+    .command('watch')
+    .description('Watch for changes and auto-sync')
+    .action(async () => {
+      const opts = program.opts();
+      await cmdWatch(opts);
+    });
+
+  program
+    .command('status')
+    .description('Show current context status')
+    .action(async () => {
+      const opts = program.opts();
+      await cmdStatus(opts);
+    });
+
+  program
+    .command('hook <action>')
+    .description('Manage git pre-commit hook (install/uninstall)')
+    .action(async (action) => {
+      const opts = program.opts();
+      await cmdHook(action, opts);
+    });
+
+  // Hidden command for pre-commit hook
+  program
+    .command('pre-commit', { hidden: true })
+    .description('Run pre-commit validation (used by git hook)')
+    .option('-b, --block', 'Block commit if context is stale')
+    .action(async (cmdOpts) => {
+      const opts = { ...program.opts(), ...cmdOpts };
+      await cmdPreCommit(opts);
+    });
+
+  return program;
+}
+
+// ============================================
+// Main Entry Point
+// ============================================
+
+export async function run(): Promise<void> {
+  const program = createProgram();
+  await program.parseAsync(process.argv);
+}
+
+// Note: Direct execution is handled by bin/cognitive.js
+// This module exports run() and createProgram() for programmatic use

packages/cognitive-context/src/config.schema.ts

@@ -0,0 +1,202 @@
+/**
+ * Configuration schema and validation using Zod
+ *
+ * Defines the structure of cognitive.config.yaml
+ */
+
+import { z } from 'zod';
+
+// ============================================
+// Tool Configuration Schema
+// ============================================
+
+export const toolNameSchema = z.enum([
+  'cursor',
+  'claude',
+  'continue',
+  'aider',
+  'copilot',
+  'windsurf',
+]);
+
+export const toolConfigSchema = z.object({
+  name: toolNameSchema,
+  enabled: z.boolean().default(true),
+  outputPath: z.string().optional(),
+});
+
+// ============================================
+// Token Budget Schema
+// ============================================
+
+export const tokenBudgetSchema = z.object({
+  /** Maximum tokens for SUMMARY.md (default: 300) */
+  summary: z.number().min(100).max(1000).default(300),
+  /** Maximum tokens for capabilities.yaml (default: 2000) */
+  capabilities: z.number().min(500).max(10000).default(2000),
+  /** Maximum tokens per wisdom file (default: 1500) */
+  wisdomPerFile: z.number().min(200).max(5000).default(1500),
+  /** Total budget across all context files (default: 20000) */
+  total: z.number().min(5000).max(100000).default(20000),
+});
+
+// ============================================
+// Watch Configuration Schema
+// ============================================
+
+export const watchConfigSchema = z.object({
+  enabled: z.boolean().default(false),
+  debounceMs: z.number().min(100).max(5000).default(500),
+  ignorePaths: z.array(z.string()).default([
+    'node_modules',
+    '.git',
+    'dist',
+    'build',
+    '.next',
+    'coverage',
+  ]),
+});
+
+// ============================================
+// Main Configuration Schema
+// ============================================
+
+export const cognitiveConfigSchema = z.object({
+  /** Schema version for migrations */
+  version: z.literal('1.0').default('1.0'),
+
+  /** Project root (auto-detected if not specified) */
+  projectRoot: z.string().optional(),
+
+  /** Source directories to scan for entities */
+  sourceDirs: z.array(z.string()).default([
+    'src',
+    'app',
+    'lib',
+    'packages/*/src',
+  ]),
+
+  /** Glob patterns for files to include */
+  includePatterns: z.array(z.string()).default([
+    '**/*.ts',
+    '**/*.tsx',
+    '**/*.js',
+    '**/*.jsx',
+  ]),
+
+  /** Glob patterns for files to exclude */
+  excludePatterns: z.array(z.string()).default([
+    '**/*.test.*',
+    '**/*.spec.*',
+    '**/*.stories.*',
+    '**/__tests__/**',
+    '**/__mocks__/**',
+    '**/node_modules/**',
+    '**/dist/**',
+    '**/build/**',
+  ]),
+
+  /** Token budgets for various context files */
+  tokenBudget: tokenBudgetSchema.default({}),
+
+  /** Tools to sync context to */
+  tools: z.array(toolConfigSchema).default([
+    { name: 'cursor', enabled: true },
+    { name: 'claude', enabled: true },
+  ]),
+
+  /** Watch mode configuration */
+  watch: watchConfigSchema.default({}),
+
+  /** Output directory for generated context (default: .cognitive) */
+  outputDir: z.string().default('.cognitive'),
+
+  /** Whether to auto-commit context changes */
+  autoCommit: z.boolean().default(false),
+
+  /** CI mode - stricter validation, non-zero exit on issues */
+  ci: z.boolean().default(false),
+});
+
+// ============================================
+// Type Exports
+// ============================================
+
+export type ToolName = z.infer<typeof toolNameSchema>;
+export type ToolConfigInput = z.input<typeof toolConfigSchema>;
+export type TokenBudgetInput = z.input<typeof tokenBudgetSchema>;
+export type WatchConfigInput = z.input<typeof watchConfigSchema>;
+export type CognitiveConfigInput = z.input<typeof cognitiveConfigSchema>;
+export type CognitiveConfigOutput = z.output<typeof cognitiveConfigSchema>;
+
+// ============================================
+// Default Configuration
+// ============================================
+
+export const DEFAULT_CONFIG: CognitiveConfigOutput = cognitiveConfigSchema.parse({});
+
+// ============================================
+// Config File Templates
+// ============================================
+
+export const CONFIG_FILE_TEMPLATE = `# Cognitive Context Configuration
+# https://github.com/your-org/cognitive-context
+
+version: "1.0"
+
+# Directories to scan for entities
+sourceDirs:
+  - src
+  - app
+  - lib
+
+# File patterns to include
+includePatterns:
+  - "**/*.ts"
+  - "**/*.tsx"
+
+# Patterns to exclude
+excludePatterns:
+  - "**/*.test.*"
+  - "**/*.spec.*"
+  - "**/node_modules/**"
+
+# Token budgets (prevents context overflow)
+tokenBudget:
+  summary: 300        # SUMMARY.md max tokens
+  capabilities: 2000  # capabilities.yaml max tokens
+  wisdomPerFile: 1500 # Per wisdom file
+  total: 20000        # Total context budget
+
+# Tools to sync context to
+tools:
+  - name: cursor
+    enabled: true
+  - name: claude
+    enabled: true
+
+# Watch mode (auto-update on file changes)
+watch:
+  enabled: false
+  debounceMs: 500
+`;
+
+// ============================================
+// Validation Helpers
+// ============================================
+
+export function validateConfig(input: unknown): CognitiveConfigOutput {
+  return cognitiveConfigSchema.parse(input);
+}
+
+export function validateConfigSafe(input: unknown): {
+  success: boolean;
+  data?: CognitiveConfigOutput;
+  error?: z.ZodError;
+} {
+  const result = cognitiveConfigSchema.safeParse(input);
+  if (result.success) {
+    return { success: true, data: result.data };
+  }
+  return { success: false, error: result.error };
+}

packages/cognitive-context/src/config.test.ts

@@ -0,0 +1,286 @@
+/**
+ * Tests for configuration loader
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { mkdir, writeFile, rm } from 'node:fs/promises';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+import {
+  findConfigFile,
+  loadConfig,
+  initConfig,
+  loadConfigOrDefault,
+  ConfigNotFoundError,
+  ConfigParseError,
+  ConfigValidationError,
+} from './config.js';
+import { DEFAULT_CONFIG } from './config.schema.js';
+
+// ============================================
+// Test Fixtures
+// ============================================
+
+const VALID_CONFIG = `
+version: "1.0"
+sourceDirs:
+  - src
+  - lib
+includePatterns:
+  - "**/*.ts"
+tokenBudget:
+  summary: 400
+  total: 25000
+tools:
+  - name: cursor
+    enabled: true
+`;
+
+const MINIMAL_CONFIG = `
+version: "1.0"
+`;
+
+const INVALID_YAML = `
+version: "1.0"
+sourceDirs:
+  - src
+  invalid yaml here
+    - missing colon
+`;
+
+const INVALID_CONFIG = `
+version: "2.0"
+tokenBudget:
+  summary: 50
+`;
+
+// ============================================
+// Test Helpers
+// ============================================
+
+async function createTempDir(): Promise<string> {
+  const tempDir = join(tmpdir(), `cognitive-test-${Date.now()}-${Math.random().toString(36).slice(2)}`);
+  await mkdir(tempDir, { recursive: true });
+  return tempDir;
+}
+
+async function createNestedDirs(base: string, ...paths: string[]): Promise<string> {
+  const fullPath = join(base, ...paths);
+  await mkdir(fullPath, { recursive: true });
+  return fullPath;
+}
+
+// ============================================
+// Tests
+// ============================================
+
+describe('findConfigFile', () => {
+  let tempDir: string;
+
+  beforeEach(async () => {
+    tempDir = await createTempDir();
+  });
+
+  afterEach(async () => {
+    await rm(tempDir, { recursive: true, force: true });
+  });
+
+  it('should find cognitive.config.yaml in current directory', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, VALID_CONFIG);
+
+    const result = await findConfigFile(tempDir);
+    expect(result).toBe(configPath);
+  });
+
+  it('should find cognitive.config.yml as fallback', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yml');
+    await writeFile(configPath, VALID_CONFIG);
+
+    const result = await findConfigFile(tempDir);
+    expect(result).toBe(configPath);
+  });
+
+  it('should find .cognitive/config.yaml as fallback', async () => {
+    const cognitiveDir = join(tempDir, '.cognitive');
+    await mkdir(cognitiveDir);
+    const configPath = join(cognitiveDir, 'config.yaml');
+    await writeFile(configPath, VALID_CONFIG);
+
+    const result = await findConfigFile(tempDir);
+    expect(result).toBe(configPath);
+  });
+
+  it('should prefer cognitive.config.yaml over alternatives', async () => {
+    const yamlPath = join(tempDir, 'cognitive.config.yaml');
+    const ymlPath = join(tempDir, 'cognitive.config.yml');
+    await writeFile(yamlPath, VALID_CONFIG);
+    await writeFile(ymlPath, VALID_CONFIG);
+
+    const result = await findConfigFile(tempDir);
+    expect(result).toBe(yamlPath);
+  });
+
+  it('should walk up directory tree to find config', async () => {
+    const nestedDir = await createNestedDirs(tempDir, 'a', 'b', 'c');
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, VALID_CONFIG);
+
+    const result = await findConfigFile(nestedDir);
+    expect(result).toBe(configPath);
+  });
+
+  it('should return null when no config exists', async () => {
+    const result = await findConfigFile(tempDir);
+    expect(result).toBeNull();
+  });
+});
+
+describe('loadConfig', () => {
+  let tempDir: string;
+
+  beforeEach(async () => {
+    tempDir = await createTempDir();
+  });
+
+  afterEach(async () => {
+    await rm(tempDir, { recursive: true, force: true });
+  });
+
+  it('should load and validate a valid config', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, VALID_CONFIG);
+
+    const config = await loadConfig(tempDir);
+
+    expect(config.version).toBe('1.0');
+    expect(config.sourceDirs).toEqual(['src', 'lib']);
+    expect(config.includePatterns).toEqual(['**/*.ts']);
+    expect(config.tokenBudget.summary).toBe(400);
+    expect(config.tokenBudget.total).toBe(25000);
+    expect(config.projectRoot).toBe(tempDir);
+  });
+
+  it('should apply defaults for missing fields', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, MINIMAL_CONFIG);
+
+    const config = await loadConfig(tempDir);
+
+    expect(config.version).toBe('1.0');
+    expect(config.sourceDirs).toEqual(DEFAULT_CONFIG.sourceDirs);
+    expect(config.includePatterns).toEqual(DEFAULT_CONFIG.includePatterns);
+    expect(config.excludePatterns).toEqual(DEFAULT_CONFIG.excludePatterns);
+    expect(config.tokenBudget).toEqual(DEFAULT_CONFIG.tokenBudget);
+    expect(config.outputDir).toBe('.cognitive');
+  });
+
+  it('should throw ConfigNotFoundError when no config exists', async () => {
+    await expect(loadConfig(tempDir)).rejects.toThrow(ConfigNotFoundError);
+  });
+
+  it('should throw ConfigParseError for invalid YAML', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, INVALID_YAML);
+
+    await expect(loadConfig(tempDir)).rejects.toThrow(ConfigParseError);
+  });
+
+  it('should throw ConfigValidationError for invalid config values', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, INVALID_CONFIG);
+
+    await expect(loadConfig(tempDir)).rejects.toThrow(ConfigValidationError);
+  });
+
+  it('should handle empty config file', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, '');
+
+    const config = await loadConfig(tempDir);
+    // Should apply all defaults
+    expect(config.version).toBe('1.0');
+    expect(config.sourceDirs).toEqual(DEFAULT_CONFIG.sourceDirs);
+  });
+
+  it('should resolve relative projectRoot to absolute path', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, `
+version: "1.0"
+projectRoot: "./subdir"
+`);
+    await mkdir(join(tempDir, 'subdir'));
+
+    const config = await loadConfig(tempDir);
+    expect(config.projectRoot).toBe(join(tempDir, 'subdir'));
+  });
+});
+
+describe('initConfig', () => {
+  let tempDir: string;
+
+  beforeEach(async () => {
+    tempDir = await createTempDir();
+  });
+
+  afterEach(async () => {
+    await rm(tempDir, { recursive: true, force: true });
+  });
+
+  it('should create a default config file', async () => {
+    const configPath = await initConfig(tempDir);
+
+    expect(configPath).toBe(join(tempDir, 'cognitive.config.yaml'));
+
+    // Should be loadable
+    const config = await loadConfig(tempDir);
+    expect(config.version).toBe('1.0');
+  });
+
+  it('should throw if config already exists', async () => {
+    await writeFile(join(tempDir, 'cognitive.config.yaml'), VALID_CONFIG);
+
+    await expect(initConfig(tempDir)).rejects.toThrow('already exists');
+  });
+
+  it('should throw if directory does not exist', async () => {
+    const nonExistent = join(tempDir, 'nonexistent');
+
+    await expect(initConfig(nonExistent)).rejects.toThrow('does not exist');
+  });
+});
+
+describe('loadConfigOrDefault', () => {
+  let tempDir: string;
+
+  beforeEach(async () => {
+    tempDir = await createTempDir();
+  });
+
+  afterEach(async () => {
+    await rm(tempDir, { recursive: true, force: true });
+  });
+
+  it('should load config when it exists', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, VALID_CONFIG);
+
+    const config = await loadConfigOrDefault(tempDir);
+    expect(config.tokenBudget.summary).toBe(400);
+  });
+
+  it('should return defaults when no config exists', async () => {
+    const config = await loadConfigOrDefault(tempDir);
+
+    expect(config.version).toBe(DEFAULT_CONFIG.version);
+    expect(config.sourceDirs).toEqual(DEFAULT_CONFIG.sourceDirs);
+    expect(config.projectRoot).toBe(tempDir);
+  });
+
+  it('should still throw for parse errors', async () => {
+    const configPath = join(tempDir, 'cognitive.config.yaml');
+    await writeFile(configPath, INVALID_YAML);
+
+    await expect(loadConfigOrDefault(tempDir)).rejects.toThrow(ConfigParseError);
+  });
+});

packages/cognitive-context/src/config.ts

@@ -0,0 +1,244 @@
+/**
+ * Configuration loader for cognitive-context
+ *
+ * Handles finding, loading, and validating cognitive.config.yaml files.
+ */
+
+import { readFile, writeFile, access, stat } from 'node:fs/promises';
+import { resolve, dirname, join } from 'node:path';
+import { parse as parseYaml } from 'yaml';
+import {
+  validateConfig,
+  DEFAULT_CONFIG,
+  CONFIG_FILE_TEMPLATE,
+  type CognitiveConfigOutput,
+} from './config.schema.js';
+
+// ============================================
+// Constants
+// ============================================
+
+/** Config file names to search for, in priority order */
+const CONFIG_FILE_NAMES = [
+  'cognitive.config.yaml',
+  'cognitive.config.yml',
+  '.cognitive/config.yaml',
+] as const;
+
+// ============================================
+// Error Classes
+// ============================================
+
+export class ConfigNotFoundError extends Error {
+  constructor(searchPath: string) {
+    super(
+      `No cognitive config file found. Searched from: ${searchPath}\n` +
+        `Create one with: cognitive init\n` +
+        `Or create manually: cognitive.config.yaml`
+    );
+    this.name = 'ConfigNotFoundError';
+  }
+}
+
+export class ConfigParseError extends Error {
+  constructor(filePath: string, cause: unknown) {
+    const message = cause instanceof Error ? cause.message : String(cause);
+    super(`Failed to parse config file: ${filePath}\n${message}`, { cause });
+    this.name = 'ConfigParseError';
+  }
+}
+
+export class ConfigValidationError extends Error {
+  constructor(filePath: string, cause: unknown) {
+    const message = cause instanceof Error ? cause.message : String(cause);
+    super(`Invalid config in: ${filePath}\n${message}`, { cause });
+    this.name = 'ConfigValidationError';
+  }
+}
+
+// ============================================
+// Helper Functions
+// ============================================
+
+/**
+ * Check if a file exists
+ */
+async function fileExists(filePath: string): Promise<boolean> {
+  try {
+    await access(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Check if a path is a directory
+ */
+async function isDirectory(path: string): Promise<boolean> {
+  try {
+    const stats = await stat(path);
+    return stats.isDirectory();
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Get the filesystem root for the current platform
+ */
+function getFilesystemRoot(): string {
+  return process.platform === 'win32' ? dirname(process.cwd()).split('\\')[0] + '\\' : '/';
+}
+
+// ============================================
+// Main Functions
+// ============================================
+
+/**
+ * Find a cognitive config file by walking up the directory tree.
+ *
+ * Search order in each directory:
+ * 1. cognitive.config.yaml
+ * 2. cognitive.config.yml
+ * 3. .cognitive/config.yaml
+ *
+ * @param startDir - Directory to start searching from
+ * @returns Absolute path to config file, or null if not found
+ */
+export async function findConfigFile(startDir: string): Promise<string | null> {
+  let currentDir = resolve(startDir);
+  const root = getFilesystemRoot();
+
+  while (true) {
+    // Check each possible config file name
+    for (const fileName of CONFIG_FILE_NAMES) {
+      const configPath = join(currentDir, fileName);
+      if (await fileExists(configPath)) {
+        return configPath;
+      }
+    }
+
+    // Check if we've reached the filesystem root
+    const parentDir = dirname(currentDir);
+    if (parentDir === currentDir || currentDir === root) {
+      return null;
+    }
+
+    currentDir = parentDir;
+  }
+}
+
+/**
+ * Load and validate a cognitive config file.
+ *
+ * @param projectRoot - Optional project root directory. If not provided,
+ *                      searches up from current directory.
+ * @returns Validated and merged configuration
+ * @throws ConfigNotFoundError if no config file is found
+ * @throws ConfigParseError if YAML parsing fails
+ * @throws ConfigValidationError if config validation fails
+ */
+export async function loadConfig(projectRoot?: string): Promise<CognitiveConfigOutput> {
+  const searchDir = projectRoot ?? process.cwd();
+  const resolvedSearchDir = resolve(searchDir);
+
+  // Find the config file
+  const configPath = await findConfigFile(resolvedSearchDir);
+  if (!configPath) {
+    throw new ConfigNotFoundError(resolvedSearchDir);
+  }
+
+  // Read and parse the config file
+  let rawContent: string;
+  try {
+    rawContent = await readFile(configPath, 'utf-8');
+  } catch (error) {
+    throw new ConfigParseError(configPath, error);
+  }
+
+  // Parse YAML
+  let parsed: unknown;
+  try {
+    parsed = parseYaml(rawContent);
+  } catch (error) {
+    throw new ConfigParseError(configPath, error);
+  }
+
+  // Handle empty config file (parsed as null) and ensure object type
+  const parsedConfig: Record<string, unknown> =
+    parsed !== null && typeof parsed === 'object' && !Array.isArray(parsed)
+      ? (parsed as Record<string, unknown>)
+      : {};
+
+  // Merge with defaults and validate
+  const configDir = dirname(configPath);
+  const mergedInput = {
+    ...parsedConfig,
+    // Set projectRoot to the directory containing the config file if not specified
+    projectRoot:
+      parsedConfig.projectRoot !== undefined
+        ? resolve(configDir, String(parsedConfig.projectRoot))
+        : configDir,
+  };
+
+  try {
+    const validated = validateConfig(mergedInput);
+    return validated;
+  } catch (error) {
+    throw new ConfigValidationError(configPath, error);
+  }
+}
+
+/**
+ * Initialize a new cognitive config file in the specified directory.
+ *
+ * @param projectRoot - Directory where to create the config file
+ * @returns Absolute path to the created config file
+ * @throws Error if the file already exists or cannot be written
+ */
+export async function initConfig(projectRoot: string): Promise<string> {
+  const resolvedRoot = resolve(projectRoot);
+
+  // Verify the directory exists
+  if (!(await isDirectory(resolvedRoot))) {
+    throw new Error(`Directory does not exist: ${resolvedRoot}`);
+  }
+
+  // Check if config already exists
+  for (const fileName of CONFIG_FILE_NAMES) {
+    const configPath = join(resolvedRoot, fileName);
+    if (await fileExists(configPath)) {
+      throw new Error(`Config file already exists: ${configPath}`);
+    }
+  }
+
+  // Create the default config file
+  const configPath = join(resolvedRoot, CONFIG_FILE_NAMES[0]);
+  await writeFile(configPath, CONFIG_FILE_TEMPLATE, 'utf-8');
+
+  return configPath;
+}
+
+/**
+ * Load config with defaults if no config file exists.
+ * Unlike loadConfig, this does not throw if no config is found.
+ *
+ * @param projectRoot - Optional project root directory
+ * @returns Configuration (loaded or default)
+ */
+export async function loadConfigOrDefault(projectRoot?: string): Promise<CognitiveConfigOutput> {
+  try {
+    return await loadConfig(projectRoot);
+  } catch (error) {
+    if (error instanceof ConfigNotFoundError) {
+      // Return defaults with projectRoot set
+      const resolvedRoot = resolve(projectRoot ?? process.cwd());
+      return {
+        ...DEFAULT_CONFIG,
+        projectRoot: resolvedRoot,
+      };
+    }
+    throw error;
+  }
+}

packages/cognitive-context/src/drift.ts

@@ -0,0 +1,558 @@
+/**
+ * Drift Detector
+ *
+ * Detects changes between the current codebase state and a saved knowledge graph.
+ * Used to determine when cognitive context needs to be regenerated or synced.
+ */
+
+import type {
+  KnowledgeGraph,
+  DriftReport,
+  StalenessLevel,
+  ExtractedEntity,
+} from './types.js';
+
+// ============================================
+// Constants
+// ============================================
+
+/** Threshold for fresh classification (percentage of entities changed) */
+const FRESH_CHANGE_THRESHOLD = 0.05; // 5%
+
+/** Threshold for stale classification (percentage of entities changed) */
+const STALE_CHANGE_THRESHOLD = 0.20; // 20%
+
+/** Hours threshold for fresh classification */
+const FRESH_HOURS_THRESHOLD = 24;
+
+/** Days threshold for stale classification */
+const STALE_DAYS_THRESHOLD = 7;
+
+// ============================================
+// Types
+// ============================================
+
+export interface DriftDetectOptions {
+  /**
+   * Custom threshold for fresh classification (0-1)
+   * @default 0.05 (5%)
+   */
+  freshThreshold?: number;
+
+  /**
+   * Custom threshold for stale classification (0-1)
+   * @default 0.20 (20%)
+   */
+  staleThreshold?: number;
+
+  /**
+   * Custom hours threshold for fresh time-based classification
+   * @default 24
+   */
+  freshHoursThreshold?: number;
+
+  /**
+   * Custom days threshold for stale time-based classification
+   * @default 7
+   */
+  staleDaysThreshold?: number;
+}
+
+type EntityChangeType = 'added' | 'removed' | 'modified' | 'unchanged';
+
+// ============================================
+// Helper Functions
+// ============================================
+
+/**
+ * Compare two entities and determine the type of change
+ *
+ * @param currentEntity - Entity from current graph (null if removed)
+ * @param savedEntity - Entity from saved graph (null if added)
+ * @returns The type of change detected
+ */
+function compareEntities(
+  currentEntity: ExtractedEntity | null,
+  savedEntity: ExtractedEntity | null
+): EntityChangeType {
+  // Entity was added (exists in current but not in saved)
+  if (currentEntity && !savedEntity) {
+    return 'added';
+  }
+
+  // Entity was removed (exists in saved but not in current)
+  if (!currentEntity && savedEntity) {
+    return 'removed';
+  }
+
+  // Both exist - compare by hash
+  if (currentEntity && savedEntity) {
+    if (currentEntity.hash !== savedEntity.hash) {
+      return 'modified';
+    }
+    return 'unchanged';
+  }
+
+  // Both null - shouldn't happen but handle gracefully
+  return 'unchanged';
+}
+
+/**
+ * Parse a date from various formats (ISO string or Date object)
+ *
+ * @param dateValue - Date value to parse
+ * @returns Parsed Date object
+ */
+function parseDate(dateValue: string | Date): Date {
+  if (dateValue instanceof Date) {
+    return dateValue;
+  }
+  return new Date(dateValue);
+}
+
+/**
+ * Calculate hours between two dates
+ *
+ * @param from - Start date
+ * @param to - End date
+ * @returns Number of hours between dates
+ */
+function hoursBetween(from: Date, to: Date): number {
+  const diffMs = to.getTime() - from.getTime();
+  return diffMs / (1000 * 60 * 60);
+}
+
+/**
+ * Calculate days between two dates
+ *
+ * @param from - Start date
+ * @param to - End date
+ * @returns Number of days between dates
+ */
+function daysBetween(from: Date, to: Date): number {
+  return hoursBetween(from, to) / 24;
+}
+
+/**
+ * Classify staleness based on change percentage and time elapsed
+ *
+ * @param changePercentage - Percentage of entities that changed (0-1)
+ * @param lastSync - Last sync timestamp
+ * @param now - Current timestamp
+ * @param options - Custom thresholds
+ * @returns Staleness classification
+ */
+function classifyStaleness(
+  changePercentage: number,
+  lastSync: Date,
+  now: Date,
+  options: DriftDetectOptions = {}
+): StalenessLevel {
+  const freshThreshold = options.freshThreshold ?? FRESH_CHANGE_THRESHOLD;
+  const staleThreshold = options.staleThreshold ?? STALE_CHANGE_THRESHOLD;
+  const freshHours = options.freshHoursThreshold ?? FRESH_HOURS_THRESHOLD;
+  const staleDays = options.staleDaysThreshold ?? STALE_DAYS_THRESHOLD;
+
+  const hoursSinceSync = hoursBetween(lastSync, now);
+  const daysSinceSync = daysBetween(lastSync, now);
+
+  // Critical: >20% changed OR >7 days since sync
+  if (changePercentage > staleThreshold || daysSinceSync > staleDays) {
+    return 'critical';
+  }
+
+  // Stale: 5-20% changed OR 1-7 days since sync
+  if (changePercentage > freshThreshold || hoursSinceSync > freshHours) {
+    return 'stale';
+  }
+
+  // Fresh: <5% changed AND within 24 hours
+  return 'fresh';
+}
+
+/**
+ * Determine the recommended action based on staleness and changes
+ *
+ * @param staleness - Staleness classification
+ * @param hasChanges - Whether any changes were detected
+ * @returns Recommended action
+ */
+function determineRecommendation(
+  staleness: StalenessLevel,
+  hasChanges: boolean
+): 'none' | 'sync' | 'regenerate' {
+  // No changes and fresh - no action needed
+  if (!hasChanges && staleness === 'fresh') {
+    return 'none';
+  }
+
+  // Critical staleness - full regeneration recommended
+  if (staleness === 'critical') {
+    return 'regenerate';
+  }
+
+  // Stale with changes - sync recommended
+  if (staleness === 'stale' || hasChanges) {
+    return 'sync';
+  }
+
+  return 'none';
+}
+
+/**
+ * Create an entity lookup map from a knowledge graph
+ *
+ * @param graph - Knowledge graph to process
+ * @returns Map of entity key to entity
+ */
+function createEntityMap(
+  graph: KnowledgeGraph | null
+): Map<string, ExtractedEntity> {
+  const map = new Map<string, ExtractedEntity>();
+
+  if (!graph || !graph.entities) {
+    return map;
+  }
+
+  // Entities are stored as Record<string, ExtractedEntity>
+  for (const [key, entity] of Object.entries(graph.entities)) {
+    if (entity) {
+      map.set(key, entity);
+    }
+  }
+
+  return map;
+}
+
+/**
+ * Get unique file paths from entities
+ *
+ * @param entities - Set of entity keys
+ * @param entityMap - Map of entity key to entity
+ * @returns Set of unique file paths
+ */
+function getUniquePaths(
+  entities: Set<string>,
+  entityMap: Map<string, ExtractedEntity>
+): Set<string> {
+  const paths = new Set<string>();
+
+  for (const key of entities) {
+    const entity = entityMap.get(key);
+    if (entity?.path) {
+      paths.add(entity.path);
+    }
+  }
+
+  return paths;
+}
+
+// ============================================
+// Main Exports
+// ============================================
+
+/**
+ * Detect drift between current codebase state and saved knowledge graph
+ *
+ * Compares entities by hash to identify additions, removals, and modifications.
+ * Classifies staleness based on change percentage and time elapsed since last sync.
+ *
+ * @param currentGraph - Knowledge graph representing current codebase state
+ * @param savedGraph - Knowledge graph from last sync (null for first run)
+ * @param options - Custom detection thresholds
+ * @returns Drift report with changes and recommendations
+ *
+ * @example
+ * ```typescript
+ * const current = await buildKnowledgeGraph('./src');
+ * const saved = await loadSavedGraph('.cognitive/knowledge.json');
+ * const drift = detectDrift(current, saved);
+ *
+ * if (drift.recommendation === 'regenerate') {
+ *   console.log('Major changes detected, regenerating context...');
+ * }
+ * ```
+ */
+export function detectDrift(
+  currentGraph: KnowledgeGraph | null,
+  savedGraph: KnowledgeGraph | null,
+  options: DriftDetectOptions = {}
+): DriftReport {
+  const now = new Date();
+
+  // Handle first run (no saved graph) - treat as fresh
+  if (!savedGraph) {
+    const currentMap = createEntityMap(currentGraph);
+    const entityKeys = Array.from(currentMap.keys());
+
+    return {
+      filesChanged: 0,
+      entitiesAdded: entityKeys,
+      entitiesRemoved: [],
+      entitiesModified: [],
+      lastSync: now,
+      staleness: 'fresh',
+      recommendation: entityKeys.length > 0 ? 'sync' : 'none',
+    };
+  }
+
+  // Handle empty current graph (project cleared)
+  if (!currentGraph) {
+    const savedMap = createEntityMap(savedGraph);
+    const entityKeys = Array.from(savedMap.keys());
+
+    return {
+      filesChanged: entityKeys.length > 0 ? savedMap.size : 0,
+      entitiesAdded: [],
+      entitiesRemoved: entityKeys,
+      entitiesModified: [],
+      lastSync: parseDate(savedGraph.meta.generatedAt),
+      staleness: entityKeys.length > 0 ? 'critical' : 'fresh',
+      recommendation: entityKeys.length > 0 ? 'regenerate' : 'none',
+    };
+  }
+
+  // Create lookup maps for efficient comparison
+  const currentMap = createEntityMap(currentGraph);
+  const savedMap = createEntityMap(savedGraph);
+
+  // Collect all unique entity keys
+  const allKeys = new Set<string>([...currentMap.keys(), ...savedMap.keys()]);
+
+  // Track changes
+  const entitiesAdded: string[] = [];
+  const entitiesRemoved: string[] = [];
+  const entitiesModified: string[] = [];
+  const changedEntities = new Set<string>();
+
+  // Compare each entity
+  for (const key of allKeys) {
+    const currentEntity = currentMap.get(key) ?? null;
+    const savedEntity = savedMap.get(key) ?? null;
+
+    const changeType = compareEntities(currentEntity, savedEntity);
+
+    switch (changeType) {
+      case 'added':
+        entitiesAdded.push(key);
+        changedEntities.add(key);
+        break;
+      case 'removed':
+        entitiesRemoved.push(key);
+        changedEntities.add(key);
+        break;
+      case 'modified':
+        entitiesModified.push(key);
+        changedEntities.add(key);
+        break;
+      // 'unchanged' - no action needed
+    }
+  }
+
+  // Calculate unique files changed
+  const currentChangedPaths = getUniquePaths(changedEntities, currentMap);
+  const savedChangedPaths = getUniquePaths(changedEntities, savedMap);
+  const allChangedPaths = new Set([...currentChangedPaths, ...savedChangedPaths]);
+  const filesChanged = allChangedPaths.size;
+
+  // Calculate change percentage (based on total entities across both graphs)
+  const totalEntities = Math.max(allKeys.size, 1); // Avoid division by zero
+  const changePercentage = changedEntities.size / totalEntities;
+
+  // Determine last sync time
+  const lastSync = parseDate(savedGraph.meta.generatedAt);
+
+  // Classify staleness
+  const staleness = classifyStaleness(changePercentage, lastSync, now, options);
+
+  // Determine recommendation
+  const hasChanges = changedEntities.size > 0;
+  const recommendation = determineRecommendation(staleness, hasChanges);
+
+  return {
+    filesChanged,
+    entitiesAdded,
+    entitiesRemoved,
+    entitiesModified,
+    lastSync,
+    staleness,
+    recommendation,
+  };
+}
+
+/**
+ * Check if a drift report indicates staleness requiring action
+ *
+ * @param report - Drift report to check
+ * @returns True if the report indicates stale or critical staleness
+ *
+ * @example
+ * ```typescript
+ * const drift = detectDrift(current, saved);
+ * if (isStale(drift)) {
+ *   console.log('Context needs updating');
+ * }
+ * ```
+ */
+export function isStale(report: DriftReport): boolean {
+  return report.staleness !== 'fresh';
+}
+
+/**
+ * Check if a drift report indicates critical staleness
+ *
+ * @param report - Drift report to check
+ * @returns True if the report indicates critical staleness
+ */
+export function isCritical(report: DriftReport): boolean {
+  return report.staleness === 'critical';
+}
+
+/**
+ * Check if any changes were detected
+ *
+ * @param report - Drift report to check
+ * @returns True if any entities were added, removed, or modified
+ */
+export function hasChanges(report: DriftReport): boolean {
+  return (
+    report.entitiesAdded.length > 0 ||
+    report.entitiesRemoved.length > 0 ||
+    report.entitiesModified.length > 0
+  );
+}
+
+/**
+ * Get total number of changed entities
+ *
+ * @param report - Drift report to check
+ * @returns Total count of added, removed, and modified entities
+ */
+export function getTotalChanges(report: DriftReport): number {
+  return (
+    report.entitiesAdded.length +
+    report.entitiesRemoved.length +
+    report.entitiesModified.length
+  );
+}
+
+/**
+ * Format a drift report as a human-readable summary
+ *
+ * @param report - Drift report to format
+ * @returns Formatted summary string
+ *
+ * @example
+ * ```typescript
+ * const drift = detectDrift(current, saved);
+ * console.log(formatDriftSummary(drift));
+ * // Output:
+ * // Drift Report
+ * // ------------
+ * // Status: stale
+ * // Files changed: 5
+ * // Entities added: 2
+ * // Entities removed: 1
+ * // Entities modified: 3
+ * // Last sync: 2024-01-15T10:30:00.000Z
+ * // Recommendation: sync
+ * ```
+ */
+export function formatDriftSummary(report: DriftReport): string {
+  const lines: string[] = [
+    'Drift Report',
+    '------------',
+    `Status: ${report.staleness}`,
+    `Files changed: ${report.filesChanged}`,
+    `Entities added: ${report.entitiesAdded.length}`,
+    `Entities removed: ${report.entitiesRemoved.length}`,
+    `Entities modified: ${report.entitiesModified.length}`,
+    `Last sync: ${report.lastSync.toISOString()}`,
+    `Recommendation: ${report.recommendation}`,
+  ];
+
+  // Add details for non-empty changes
+  if (report.entitiesAdded.length > 0 && report.entitiesAdded.length <= 10) {
+    lines.push('', 'Added:');
+    for (const entity of report.entitiesAdded) {
+      lines.push(`  + ${entity}`);
+    }
+  } else if (report.entitiesAdded.length > 10) {
+    lines.push('', `Added: ${report.entitiesAdded.length} entities (showing first 10)`);
+    for (const entity of report.entitiesAdded.slice(0, 10)) {
+      lines.push(`  + ${entity}`);
+    }
+    lines.push(`  ... and ${report.entitiesAdded.length - 10} more`);
+  }
+
+  if (report.entitiesRemoved.length > 0 && report.entitiesRemoved.length <= 10) {
+    lines.push('', 'Removed:');
+    for (const entity of report.entitiesRemoved) {
+      lines.push(`  - ${entity}`);
+    }
+  } else if (report.entitiesRemoved.length > 10) {
+    lines.push('', `Removed: ${report.entitiesRemoved.length} entities (showing first 10)`);
+    for (const entity of report.entitiesRemoved.slice(0, 10)) {
+      lines.push(`  - ${entity}`);
+    }
+    lines.push(`  ... and ${report.entitiesRemoved.length - 10} more`);
+  }
+
+  if (report.entitiesModified.length > 0 && report.entitiesModified.length <= 10) {
+    lines.push('', 'Modified:');
+    for (const entity of report.entitiesModified) {
+      lines.push(`  ~ ${entity}`);
+    }
+  } else if (report.entitiesModified.length > 10) {
+    lines.push('', `Modified: ${report.entitiesModified.length} entities (showing first 10)`);
+    for (const entity of report.entitiesModified.slice(0, 10)) {
+      lines.push(`  ~ ${entity}`);
+    }
+    lines.push(`  ... and ${report.entitiesModified.length - 10} more`);
+  }
+
+  return lines.join('\n');
+}
+
+/**
+ * Format a drift report as JSON-serializable object
+ *
+ * @param report - Drift report to format
+ * @returns JSON-serializable drift report
+ */
+export function formatDriftJSON(report: DriftReport): Record<string, unknown> {
+  return {
+    staleness: report.staleness,
+    recommendation: report.recommendation,
+    filesChanged: report.filesChanged,
+    changes: {
+      added: report.entitiesAdded.length,
+      removed: report.entitiesRemoved.length,
+      modified: report.entitiesModified.length,
+      total: getTotalChanges(report),
+    },
+    entities: {
+      added: report.entitiesAdded,
+      removed: report.entitiesRemoved,
+      modified: report.entitiesModified,
+    },
+    lastSync: report.lastSync.toISOString(),
+  };
+}
+
+/**
+ * Create an empty drift report (for error cases or initialization)
+ *
+ * @returns Empty drift report with fresh status
+ */
+export function createEmptyDriftReport(): DriftReport {
+  return {
+    filesChanged: 0,
+    entitiesAdded: [],
+    entitiesRemoved: [],
+    entitiesModified: [],
+    lastSync: new Date(),
+    staleness: 'fresh',
+    recommendation: 'none',
+  };
+}

packages/cognitive-context/src/extractor.test.ts

@@ -0,0 +1,381 @@
+/**
+ * Tests for the AST-based Entity Extractor
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import { mkdir, writeFile, rm } from 'node:fs/promises';
+import { join } from 'node:path';
+import { extractEntitiesFromFile, extractEntitiesFromDir } from './extractor.js';
+
+const TEST_DIR = join(process.cwd(), '.test-fixtures');
+
+// Test fixtures
+const fixtures = {
+  reactComponent: `
+import React from 'react';
+
+export interface ButtonProps {
+  /** Button label text */
+  label: string;
+  onClick?: () => void;
+  disabled?: boolean;
+}
+
+export function Button({ label, onClick, disabled }: ButtonProps) {
+  return (
+    <button onClick={onClick} disabled={disabled}>
+      {label}
+    </button>
+  );
+}
+
+export default Button;
+`,
+
+  customHook: `
+import { useState, useEffect } from 'react';
+
+export interface UseCounterOptions {
+  initialValue?: number;
+  step?: number;
+}
+
+export function useCounter(options: UseCounterOptions = {}) {
+  const { initialValue = 0, step = 1 } = options;
+  const [count, setCount] = useState(initialValue);
+
+  const increment = () => setCount(c => c + step);
+  const decrement = () => setCount(c => c - step);
+  const reset = () => setCount(initialValue);
+
+  return { count, increment, decrement, reset };
+}
+`,
+
+  utilityModule: `
+/**
+ * String utility functions
+ */
+
+export function capitalize(str: string): string {
+  return str.charAt(0).toUpperCase() + str.slice(1);
+}
+
+export function slugify(str: string): string {
+  return str
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, '-')
+    .replace(/(^-|-$)/g, '');
+}
+
+export const DEFAULT_SEPARATOR = '-';
+`,
+
+  zodSchema: `
+import { z } from 'zod';
+
+export const UserSchema = z.object({
+  id: z.string().uuid(),
+  email: z.string().email(),
+  name: z.string().min(1),
+  createdAt: z.date(),
+});
+
+export type User = z.infer<typeof UserSchema>;
+
+export const CreateUserSchema = UserSchema.omit({ id: true, createdAt: true });
+`,
+
+  typesFile: `
+export interface ApiResponse<T> {
+  data: T;
+  status: number;
+  message?: string;
+}
+
+export type RequestMethod = 'GET' | 'POST' | 'PUT' | 'DELETE';
+
+export interface RequestConfig {
+  method: RequestMethod;
+  headers?: Record<string, string>;
+  body?: unknown;
+}
+`,
+
+  moduleWithImports: `
+import { join, resolve } from 'node:path';
+import { readFile } from 'node:fs/promises';
+import type { Config } from './types.js';
+import defaultConfig from '../config.js';
+
+export async function loadConfig(path: string): Promise<Config> {
+  const fullPath = resolve(process.cwd(), path);
+  const content = await readFile(fullPath, 'utf-8');
+  return { ...defaultConfig, ...JSON.parse(content) };
+}
+`,
+
+  defaultExportArrow: `
+import React from 'react';
+
+interface CardProps {
+  title: string;
+  children: React.ReactNode;
+}
+
+const Card = ({ title, children }: CardProps) => (
+  <div className="card">
+    <h2>{title}</h2>
+    {children}
+  </div>
+);
+
+export default Card;
+`,
+
+  classComponent: `
+import React, { Component } from 'react';
+
+interface CounterState {
+  count: number;
+}
+
+export class Counter extends Component<{}, CounterState> {
+  state = { count: 0 };
+
+  render() {
+    return (
+      <div>
+        <span>{this.state.count}</span>
+        <button onClick={() => this.setState({ count: this.state.count + 1 })}>
+          +
+        </button>
+      </div>
+    );
+  }
+}
+`,
+};
+
+describe('extractEntitiesFromFile', () => {
+  beforeAll(async () => {
+    await mkdir(TEST_DIR, { recursive: true });
+  });
+
+  afterAll(async () => {
+    await rm(TEST_DIR, { recursive: true, force: true });
+  });
+
+  it('should extract React component with props', async () => {
+    const filePath = join(TEST_DIR, 'Button.tsx');
+    await writeFile(filePath, fixtures.reactComponent);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.name).toBe('Button');
+    expect(entity!.type).toBe('component');
+    expect(entity!.exports).toHaveLength(3); // ButtonProps, Button, default
+    expect(entity!.hash).toMatch(/^[a-f0-9]{64}$/);
+
+    // Check exports
+    const buttonExport = entity!.exports.find(e => e.name === 'Button' && !e.isDefault);
+    expect(buttonExport).toBeDefined();
+    expect(buttonExport!.kind).toBe('function');
+
+    const defaultExport = entity!.exports.find(e => e.isDefault);
+    expect(defaultExport).toBeDefined();
+
+    // Check props extraction
+    expect(entity!.props).toBeDefined();
+    expect(entity!.props).toHaveLength(3);
+
+    const labelProp = entity!.props!.find(p => p.name === 'label');
+    expect(labelProp).toBeDefined();
+    expect(labelProp!.type).toBe('string');
+    expect(labelProp!.required).toBe(true);
+
+    const onClickProp = entity!.props!.find(p => p.name === 'onClick');
+    expect(onClickProp).toBeDefined();
+    expect(onClickProp!.required).toBe(false);
+  });
+
+  it('should detect custom hooks by naming convention', async () => {
+    const filePath = join(TEST_DIR, 'useCounter.ts');
+    await writeFile(filePath, fixtures.customHook);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.name).toBe('useCounter');
+    expect(entity!.type).toBe('hook');
+    expect(entity!.exports.some(e => e.name === 'UseCounterOptions')).toBe(true);
+  });
+
+  it('should extract utility functions', async () => {
+    const filePath = join(TEST_DIR, 'strings.ts');
+    await writeFile(filePath, fixtures.utilityModule);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.type).toBe('utility');
+    expect(entity!.exports).toHaveLength(3);
+
+    const names = entity!.exports.map(e => e.name);
+    expect(names).toContain('capitalize');
+    expect(names).toContain('slugify');
+    expect(names).toContain('DEFAULT_SEPARATOR');
+  });
+
+  it('should detect Zod schemas', async () => {
+    const filePath = join(TEST_DIR, 'user.schema.ts');
+    await writeFile(filePath, fixtures.zodSchema);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.type).toBe('schema');
+    expect(entity!.imports.some(i => i.source === 'zod')).toBe(true);
+  });
+
+  it('should detect type-only files', async () => {
+    const filePath = join(TEST_DIR, 'api.types.ts');
+    await writeFile(filePath, fixtures.typesFile);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.type).toBe('interface');
+    expect(entity!.exports.every(e => e.kind === 'interface' || e.kind === 'type')).toBe(true);
+  });
+
+  it('should extract imports correctly', async () => {
+    const filePath = join(TEST_DIR, 'config.loader.ts');
+    await writeFile(filePath, fixtures.moduleWithImports);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.imports).toHaveLength(4);
+
+    // Check node:path import
+    const pathImport = entity!.imports.find(i => i.source === 'node:path');
+    expect(pathImport).toBeDefined();
+    expect(pathImport!.isRelative).toBe(false);
+    expect(pathImport!.specifiers).toContain('join');
+    expect(pathImport!.specifiers).toContain('resolve');
+
+    // Check relative import
+    const typesImport = entity!.imports.find(i => i.source === './types.js');
+    expect(typesImport).toBeDefined();
+    expect(typesImport!.isRelative).toBe(true);
+  });
+
+  it('should handle arrow function default exports', async () => {
+    const filePath = join(TEST_DIR, 'Card.tsx');
+    await writeFile(filePath, fixtures.defaultExportArrow);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.name).toBe('Card');
+    expect(entity!.type).toBe('component');
+  });
+
+  it('should handle class components', async () => {
+    const filePath = join(TEST_DIR, 'Counter.tsx');
+    await writeFile(filePath, fixtures.classComponent);
+
+    const entity = await extractEntitiesFromFile(filePath);
+
+    expect(entity).not.toBeNull();
+    expect(entity!.type).toBe('component');
+    expect(entity!.exports.some(e => e.kind === 'class' && e.name === 'Counter')).toBe(true);
+  });
+
+  it('should return null for non-existent files', async () => {
+    const entity = await extractEntitiesFromFile('/non/existent/file.ts');
+    expect(entity).toBeNull();
+  });
+
+  it('should calculate consistent hashes', async () => {
+    const filePath = join(TEST_DIR, 'hash-test.ts');
+    await writeFile(filePath, fixtures.utilityModule);
+
+    const entity1 = await extractEntitiesFromFile(filePath);
+    const entity2 = await extractEntitiesFromFile(filePath);
+
+    expect(entity1).not.toBeNull();
+    expect(entity2).not.toBeNull();
+    expect(entity1!.hash).toBe(entity2!.hash);
+  });
+});
+
+describe('extractEntitiesFromDir', () => {
+  const DIR_TEST_PATH = join(TEST_DIR, 'dir-test');
+
+  beforeAll(async () => {
+    await mkdir(DIR_TEST_PATH, { recursive: true });
+    await mkdir(join(DIR_TEST_PATH, 'components'), { recursive: true });
+    await mkdir(join(DIR_TEST_PATH, 'hooks'), { recursive: true });
+    await mkdir(join(DIR_TEST_PATH, 'node_modules', 'some-package'), { recursive: true });
+
+    // Create test files
+    await writeFile(join(DIR_TEST_PATH, 'components', 'Button.tsx'), fixtures.reactComponent);
+    await writeFile(join(DIR_TEST_PATH, 'hooks', 'useCounter.ts'), fixtures.customHook);
+    await writeFile(join(DIR_TEST_PATH, 'utils.ts'), fixtures.utilityModule);
+    await writeFile(join(DIR_TEST_PATH, 'Button.test.tsx'), '// test file');
+    await writeFile(join(DIR_TEST_PATH, 'node_modules', 'some-package', 'index.ts'), 'export const x = 1;');
+  });
+
+  afterAll(async () => {
+    await rm(DIR_TEST_PATH, { recursive: true, force: true });
+  });
+
+  it('should extract all entities from directory recursively', async () => {
+    const entities = await extractEntitiesFromDir(DIR_TEST_PATH);
+
+    expect(entities.length).toBeGreaterThanOrEqual(3);
+
+    const names = entities.map(e => e.name);
+    expect(names).toContain('Button');
+    expect(names).toContain('useCounter');
+  });
+
+  it('should exclude node_modules by default', async () => {
+    const entities = await extractEntitiesFromDir(DIR_TEST_PATH);
+
+    // Should not include files from node_modules
+    const nodeModuleEntity = entities.find(e => e.path.includes('node_modules'));
+    expect(nodeModuleEntity).toBeUndefined();
+  });
+
+  it('should exclude test files by default', async () => {
+    const entities = await extractEntitiesFromDir(DIR_TEST_PATH);
+
+    // Should not include test files
+    const testEntity = entities.find(e => e.path.includes('.test.'));
+    expect(testEntity).toBeUndefined();
+  });
+
+  it('should store relative paths', async () => {
+    const entities = await extractEntitiesFromDir(DIR_TEST_PATH);
+
+    // All paths should be relative
+    for (const entity of entities) {
+      expect(entity.path.startsWith('/')).toBe(false);
+      expect(entity.path.startsWith(DIR_TEST_PATH)).toBe(false);
+    }
+  });
+
+  it('should respect custom include patterns', async () => {
+    const entities = await extractEntitiesFromDir(DIR_TEST_PATH, {
+      include: ['**/hooks/**/*.ts'],
+      exclude: [],
+    });
+
+    expect(entities.length).toBe(1);
+    expect(entities[0].name).toBe('useCounter');
+  });
+});

packages/cognitive-context/src/extractor.ts

@@ -0,0 +1,701 @@
+/**
+ * AST-based Entity Extractor
+ *
+ * Uses the TypeScript Compiler API to parse source files and extract
+ * structured entity information for the Cognitive Context System.
+ */
+
+import { createHash } from 'node:crypto';
+import { readFile, readdir, stat } from 'node:fs/promises';
+import { join, relative, extname } from 'node:path';
+import ts from 'typescript';
+import type {
+  ExtractedEntity,
+  ExtractedExport,
+  ExtractedImport,
+  EntityType,
+  PropDefinition,
+} from './types.js';
+
+// ============================================
+// Configuration
+// ============================================
+
+const DEFAULT_INCLUDE = ['**/*.ts', '**/*.tsx'];
+const DEFAULT_EXCLUDE = [
+  '**/node_modules/**',
+  '**/dist/**',
+  '**/*.test.ts',
+  '**/*.test.tsx',
+  '**/*.spec.ts',
+  '**/*.spec.tsx',
+  '**/*.d.ts',
+];
+
+// ============================================
+// Helper Functions
+// ============================================
+
+/**
+ * Calculate SHA-256 hash of file content
+ */
+function calculateHash(content: string): string {
+  return createHash('sha256').update(content).digest('hex');
+}
+
+/**
+ * Check if a name follows PascalCase convention (for component detection)
+ */
+function isPascalCase(name: string): boolean {
+  return /^[A-Z][a-zA-Z0-9]*$/.test(name);
+}
+
+/**
+ * Check if an identifier starts with 'use' (hook convention)
+ */
+function isHookName(name: string): boolean {
+  return /^use[A-Z]/.test(name);
+}
+
+/**
+ * Check if a path matches a glob-like pattern (simplified)
+ */
+function matchesPattern(path: string, pattern: string): boolean {
+  // Normalize path separators
+  const normalizedPath = path.replace(/\\/g, '/');
+  const normalizedPattern = pattern.replace(/\\/g, '/');
+
+  // Convert glob to regex (simplified - handles ** and *)
+  const regexPattern = normalizedPattern
+    // Escape special regex chars (except * which we handle specially)
+    .replace(/[.+^${}()|[\]\\]/g, '\\$&')
+    // Handle **/ at the start (match any prefix including nothing)
+    .replace(/^\*\*\//, '(?:.*\\/)?')
+    // Handle /**/ in the middle (match any number of directories)
+    .replace(/\/\*\*\//g, '(?:\\/.*\\/|\\/)')
+    // Handle /** at the end (match any suffix)
+    .replace(/\/\*\*$/, '(?:\\/.*)?')
+    // Handle remaining ** (match anything)
+    .replace(/\*\*/g, '.*')
+    // Handle single * (match anything except /)
+    .replace(/\*/g, '[^/]*');
+
+  return new RegExp(`^${regexPattern}$`).test(normalizedPath);
+}
+
+/**
+ * Check if a file should be included based on patterns
+ */
+function shouldIncludeFile(
+  filePath: string,
+  include: string[],
+  exclude: string[]
+): boolean {
+  // Check exclusions first
+  for (const pattern of exclude) {
+    if (matchesPattern(filePath, pattern)) {
+      return false;
+    }
+  }
+  // Check inclusions
+  for (const pattern of include) {
+    if (matchesPattern(filePath, pattern)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
+/**
+ * Check if a node contains JSX
+ */
+function containsJsx(node: ts.Node): boolean {
+  let hasJsx = false;
+
+  function visit(n: ts.Node): void {
+    if (
+      ts.isJsxElement(n) ||
+      ts.isJsxSelfClosingElement(n) ||
+      ts.isJsxFragment(n)
+    ) {
+      hasJsx = true;
+      return;
+    }
+    ts.forEachChild(n, visit);
+  }
+
+  visit(node);
+  return hasJsx;
+}
+
+/**
+ * Extract type string from a TypeNode
+ */
+function typeNodeToString(typeNode: ts.TypeNode, sourceFile: ts.SourceFile): string {
+  return typeNode.getText(sourceFile);
+}
+
+/**
+ * Extract props from a type reference or interface
+ */
+function extractPropsFromType(
+  node: ts.Node,
+  sourceFile: ts.SourceFile
+): PropDefinition[] | undefined {
+  const props: PropDefinition[] = [];
+
+  // Handle interface declarations
+  if (ts.isInterfaceDeclaration(node)) {
+    for (const member of node.members) {
+      if (ts.isPropertySignature(member) && member.name) {
+        const name = member.name.getText(sourceFile);
+        const type = member.type ? typeNodeToString(member.type, sourceFile) : 'unknown';
+        const required = !member.questionToken;
+
+        // Extract JSDoc comment if present
+        const jsDocComment = ts.getJSDocCommentsAndTags(member);
+        let description: string | undefined;
+        if (jsDocComment.length > 0) {
+          const jsDoc = jsDocComment[0];
+          if (ts.isJSDoc(jsDoc) && typeof jsDoc.comment === 'string') {
+            description = jsDoc.comment;
+          }
+        }
+
+        props.push({ name, type, required, description });
+      }
+    }
+  }
+
+  // Handle type literals
+  if (ts.isTypeLiteralNode(node)) {
+    for (const member of node.members) {
+      if (ts.isPropertySignature(member) && member.name) {
+        const name = member.name.getText(sourceFile);
+        const type = member.type ? typeNodeToString(member.type, sourceFile) : 'unknown';
+        const required = !member.questionToken;
+        props.push({ name, type, required });
+      }
+    }
+  }
+
+  return props.length > 0 ? props : undefined;
+}
+
+// ============================================
+// AST Extraction
+// ============================================
+
+interface ExtractionContext {
+  sourceFile: ts.SourceFile;
+  exports: ExtractedExport[];
+  imports: ExtractedImport[];
+  propsInterface?: ts.InterfaceDeclaration;
+  hasJsxExport: boolean;
+  defaultExportName?: string;
+  namedExportsWithJsx: Set<string>;
+  /** Track variable declarations that contain JSX for default export detection */
+  variablesWithJsx: Set<string>;
+  /** Track class declarations that extend React.Component or contain JSX */
+  classesWithJsx: Set<string>;
+}
+
+/**
+ * Visit all nodes in the source file to extract information
+ */
+function visitNode(node: ts.Node, ctx: ExtractionContext): void {
+  const sourceFile = ctx.sourceFile;
+
+  // Handle import declarations
+  if (ts.isImportDeclaration(node)) {
+    const moduleSpecifier = node.moduleSpecifier;
+    if (ts.isStringLiteral(moduleSpecifier)) {
+      const source = moduleSpecifier.text;
+      const isRelative = source.startsWith('.') || source.startsWith('/');
+      const specifiers: string[] = [];
+
+      if (node.importClause) {
+        // Default import
+        if (node.importClause.name) {
+          specifiers.push(node.importClause.name.text);
+        }
+        // Named imports
+        if (node.importClause.namedBindings) {
+          if (ts.isNamedImports(node.importClause.namedBindings)) {
+            for (const element of node.importClause.namedBindings.elements) {
+              specifiers.push(element.name.text);
+            }
+          } else if (ts.isNamespaceImport(node.importClause.namedBindings)) {
+            specifiers.push(`* as ${node.importClause.namedBindings.name.text}`);
+          }
+        }
+      }
+
+      ctx.imports.push({ source, specifiers, isRelative });
+    }
+  }
+
+  // Handle export declarations
+  if (ts.isExportDeclaration(node)) {
+    // Named exports: export { a, b } or export { a } from './module'
+    if (node.exportClause && ts.isNamedExports(node.exportClause)) {
+      for (const element of node.exportClause.elements) {
+        const line = sourceFile.getLineAndCharacterOfPosition(element.getStart()).line + 1;
+        ctx.exports.push({
+          name: element.name.text,
+          kind: 'const', // Default, could be refined
+          isDefault: false,
+          line,
+        });
+      }
+    }
+  }
+
+  // Handle export assignment (export default X)
+  if (ts.isExportAssignment(node) && !node.isExportEquals) {
+    const expression = node.expression;
+    let name = 'default';
+
+    if (ts.isIdentifier(expression)) {
+      name = expression.text;
+      ctx.defaultExportName = name;
+      // Check if this identifier refers to a variable/class with JSX
+      if (ctx.variablesWithJsx.has(name) || ctx.classesWithJsx.has(name)) {
+        ctx.hasJsxExport = true;
+      }
+    } else if (ts.isFunctionExpression(expression) || ts.isArrowFunction(expression)) {
+      if (containsJsx(expression)) {
+        ctx.hasJsxExport = true;
+      }
+    }
+
+    const line = sourceFile.getLineAndCharacterOfPosition(node.getStart()).line + 1;
+    ctx.exports.push({
+      name,
+      kind: 'const',
+      isDefault: true,
+      line,
+    });
+  }
+
+  // Handle function declarations with export
+  if (ts.isFunctionDeclaration(node) && node.name) {
+    const hasExport = node.modifiers?.some(m => m.kind === ts.SyntaxKind.ExportKeyword);
+    const isDefault = node.modifiers?.some(m => m.kind === ts.SyntaxKind.DefaultKeyword);
+
+    if (hasExport) {
+      const name = node.name.text;
+      const line = sourceFile.getLineAndCharacterOfPosition(node.getStart()).line + 1;
+
+      ctx.exports.push({
+        name,
+        kind: 'function',
+        isDefault: !!isDefault,
+        line,
+      });
+
+      if (containsJsx(node)) {
+        if (isDefault) {
+          ctx.hasJsxExport = true;
+          ctx.defaultExportName = name;
+        } else {
+          ctx.namedExportsWithJsx.add(name);
+        }
+      }
+    }
+  }
+
+  // Handle class declarations with export
+  if (ts.isClassDeclaration(node) && node.name) {
+    const hasExport = node.modifiers?.some(m => m.kind === ts.SyntaxKind.ExportKeyword);
+    const isDefault = node.modifiers?.some(m => m.kind === ts.SyntaxKind.DefaultKeyword);
+    const className = node.name.text;
+
+    // Check if class contains JSX (for React class components)
+    if (containsJsx(node)) {
+      ctx.classesWithJsx.add(className);
+      if (hasExport) {
+        if (isDefault) {
+          ctx.hasJsxExport = true;
+          ctx.defaultExportName = className;
+        } else {
+          ctx.namedExportsWithJsx.add(className);
+        }
+      }
+    }
+
+    if (hasExport) {
+      const line = sourceFile.getLineAndCharacterOfPosition(node.getStart()).line + 1;
+      ctx.exports.push({
+        name: className,
+        kind: 'class',
+        isDefault: !!isDefault,
+        line,
+      });
+    }
+  }
+
+  // Handle variable statements (both exported and non-exported)
+  if (ts.isVariableStatement(node)) {
+    const hasExport = node.modifiers?.some(m => m.kind === ts.SyntaxKind.ExportKeyword);
+
+    for (const declaration of node.declarationList.declarations) {
+      if (ts.isIdentifier(declaration.name)) {
+        const name = declaration.name.text;
+
+        // Check if it's an arrow function or function expression with JSX
+        let kind: ExtractedExport['kind'] = 'const';
+        let hasJsx = false;
+        if (declaration.initializer) {
+          if (ts.isArrowFunction(declaration.initializer) || ts.isFunctionExpression(declaration.initializer)) {
+            kind = 'function';
+            if (containsJsx(declaration.initializer)) {
+              hasJsx = true;
+              ctx.variablesWithJsx.add(name);
+            }
+          }
+        }
+
+        if (hasExport) {
+          const line = sourceFile.getLineAndCharacterOfPosition(declaration.getStart()).line + 1;
+          if (hasJsx) {
+            ctx.namedExportsWithJsx.add(name);
+          }
+          ctx.exports.push({
+            name,
+            kind,
+            isDefault: false,
+            line,
+          });
+        }
+      }
+    }
+  }
+
+  // Handle interface declarations with export
+  if (ts.isInterfaceDeclaration(node)) {
+    const hasExport = node.modifiers?.some(m => m.kind === ts.SyntaxKind.ExportKeyword);
+    const name = node.name.text;
+
+    if (hasExport) {
+      const line = sourceFile.getLineAndCharacterOfPosition(node.getStart()).line + 1;
+      ctx.exports.push({
+        name,
+        kind: 'interface',
+        isDefault: false,
+        line,
+      });
+    }
+
+    // Track Props interfaces for component prop extraction
+    if (name.endsWith('Props')) {
+      ctx.propsInterface = node;
+    }
+  }
+
+  // Handle type alias declarations with export
+  if (ts.isTypeAliasDeclaration(node)) {
+    const hasExport = node.modifiers?.some(m => m.kind === ts.SyntaxKind.ExportKeyword);
+
+    if (hasExport) {
+      const line = sourceFile.getLineAndCharacterOfPosition(node.getStart()).line + 1;
+      ctx.exports.push({
+        name: node.name.text,
+        kind: 'type',
+        isDefault: false,
+        line,
+      });
+    }
+  }
+
+  // Handle enum declarations with export
+  if (ts.isEnumDeclaration(node)) {
+    const hasExport = node.modifiers?.some(m => m.kind === ts.SyntaxKind.ExportKeyword);
+
+    if (hasExport) {
+      const line = sourceFile.getLineAndCharacterOfPosition(node.getStart()).line + 1;
+      ctx.exports.push({
+        name: node.name.text,
+        kind: 'enum',
+        isDefault: false,
+        line,
+      });
+    }
+  }
+
+  // Recurse into children
+  ts.forEachChild(node, child => visitNode(child, ctx));
+}
+
+/**
+ * Determine the entity type based on extracted information
+ */
+function determineEntityType(
+  ctx: ExtractionContext,
+  primaryName: string,
+  sourceFile: ts.SourceFile
+): EntityType {
+  const fileName = sourceFile.fileName.toLowerCase();
+
+  // Check for hook (use* naming convention)
+  if (isHookName(primaryName)) {
+    return 'hook';
+  }
+
+  // Check for React component (JSX + PascalCase)
+  if (ctx.hasJsxExport && isPascalCase(primaryName)) {
+    return 'component';
+  }
+
+  // Check named exports for components
+  for (const name of ctx.namedExportsWithJsx) {
+    if (isPascalCase(name)) {
+      return 'component';
+    }
+  }
+
+  // Check for Zod schema
+  const hasZodImport = ctx.imports.some(i => i.source === 'zod' || i.source.startsWith('zod/'));
+  if (hasZodImport) {
+    return 'schema';
+  }
+
+  // Check for API endpoint patterns
+  if (fileName.includes('/api/') || fileName.includes('route.')) {
+    return 'endpoint';
+  }
+
+  // Check for type/interface files
+  const hasOnlyTypeExports = ctx.exports.every(e => e.kind === 'type' || e.kind === 'interface');
+  if (hasOnlyTypeExports && ctx.exports.length > 0) {
+    const hasInterface = ctx.exports.some(e => e.kind === 'interface');
+    return hasInterface ? 'interface' : 'type';
+  }
+
+  // Check for utility functions
+  if (ctx.exports.some(e => e.kind === 'function') && !ctx.hasJsxExport) {
+    return 'utility';
+  }
+
+  // Default to module
+  return 'module';
+}
+
+// ============================================
+// Public API
+// ============================================
+
+/**
+ * Extract entities from a single TypeScript/TSX file
+ *
+ * @param filePath - Absolute path to the file
+ * @returns Extracted entity information, or null if parsing fails
+ */
+export async function extractEntitiesFromFile(
+  filePath: string
+): Promise<ExtractedEntity | null> {
+  try {
+    const content = await readFile(filePath, 'utf-8');
+    const hash = calculateHash(content);
+    const stats = await stat(filePath);
+
+    // Determine script kind based on extension
+    const ext = extname(filePath).toLowerCase();
+    let scriptKind: ts.ScriptKind;
+    switch (ext) {
+      case '.tsx':
+        scriptKind = ts.ScriptKind.TSX;
+        break;
+      case '.ts':
+        scriptKind = ts.ScriptKind.TS;
+        break;
+      case '.jsx':
+        scriptKind = ts.ScriptKind.JSX;
+        break;
+      case '.js':
+        scriptKind = ts.ScriptKind.JS;
+        break;
+      default:
+        scriptKind = ts.ScriptKind.TS;
+    }
+
+    // Parse the source file
+    const sourceFile = ts.createSourceFile(
+      filePath,
+      content,
+      ts.ScriptTarget.ESNext,
+      true,
+      scriptKind
+    );
+
+    // Create extraction context
+    const ctx: ExtractionContext = {
+      sourceFile,
+      exports: [],
+      imports: [],
+      hasJsxExport: false,
+      namedExportsWithJsx: new Set(),
+      variablesWithJsx: new Set(),
+      classesWithJsx: new Set(),
+    };
+
+    // Visit all nodes
+    ts.forEachChild(sourceFile, node => visitNode(node, ctx));
+
+    // Determine primary name (default export or first named export)
+    // Priority: default export > function exports > other exports
+    let primaryName = 'unknown';
+    const defaultExport = ctx.exports.find(e => e.isDefault);
+    if (defaultExport) {
+      primaryName = defaultExport.name !== 'default' ? defaultExport.name : ctx.defaultExportName || 'default';
+    } else if (ctx.exports.length > 0) {
+      // Prefer function exports over type/interface exports for naming
+      const functionExport = ctx.exports.find(e => e.kind === 'function');
+      const classExport = ctx.exports.find(e => e.kind === 'class');
+      if (functionExport) {
+        primaryName = functionExport.name;
+      } else if (classExport) {
+        primaryName = classExport.name;
+      } else {
+        primaryName = ctx.exports[0].name;
+      }
+    }
+
+    // Determine entity type
+    const entityType = determineEntityType(ctx, primaryName, sourceFile);
+
+    // Extract props if it's a component
+    let props: PropDefinition[] | undefined;
+    if (entityType === 'component' && ctx.propsInterface) {
+      props = extractPropsFromType(ctx.propsInterface, sourceFile);
+    }
+
+    return {
+      name: primaryName,
+      path: filePath,
+      type: entityType,
+      exports: ctx.exports,
+      imports: ctx.imports,
+      props,
+      modifiedAt: stats.mtime,
+      hash,
+    };
+  } catch (error) {
+    // Return null for unparseable files
+    console.error(`Failed to extract entities from ${filePath}:`, error);
+    return null;
+  }
+}
+
+/**
+ * Check if a directory should be excluded based on patterns
+ */
+function shouldExcludeDirectory(relativePath: string, exclude: string[]): boolean {
+  const normalizedPath = relativePath.replace(/\\/g, '/');
+
+  for (const pattern of exclude) {
+    const normalizedPattern = pattern.replace(/\\/g, '/');
+
+    // Handle patterns like **/node_modules/** - extract the directory name
+    const match = normalizedPattern.match(/^\*\*\/([^/*]+)\/\*\*$/);
+    if (match) {
+      const dirName = match[1];
+      // Check if any part of the path matches this directory name
+      const parts = normalizedPath.split('/');
+      if (parts.includes(dirName)) {
+        return true;
+      }
+    }
+
+    // Check if the directory path matches the pattern directly
+    if (matchesPattern(normalizedPath, normalizedPattern)) {
+      return true;
+    }
+
+    // Check if appending /** would match (for directory patterns)
+    if (matchesPattern(normalizedPath + '/', normalizedPattern.replace(/\*\*$/, ''))) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+/**
+ * Recursively get all TypeScript files in a directory
+ */
+async function getFilesRecursively(
+  dir: string,
+  include: string[],
+  exclude: string[],
+  baseDir: string
+): Promise<string[]> {
+  const files: string[] = [];
+  const entries = await readdir(dir, { withFileTypes: true });
+
+  for (const entry of entries) {
+    const fullPath = join(dir, entry.name);
+    const relativePath = relative(baseDir, fullPath);
+
+    if (entry.isDirectory()) {
+      // Check if directory should be excluded
+      if (!shouldExcludeDirectory(relativePath, exclude)) {
+        const subFiles = await getFilesRecursively(fullPath, include, exclude, baseDir);
+        files.push(...subFiles);
+      }
+    } else if (entry.isFile()) {
+      const ext = extname(entry.name).toLowerCase();
+      if (['.ts', '.tsx', '.js', '.jsx'].includes(ext)) {
+        if (shouldIncludeFile(relativePath, include, exclude)) {
+          files.push(fullPath);
+        }
+      }
+    }
+  }
+
+  return files;
+}
+
+export interface ExtractOptions {
+  /**
+   * Glob patterns for files to include
+   * @default ['**\/*.ts', '**\/*.tsx']
+   */
+  include?: string[];
+
+  /**
+   * Glob patterns for files to exclude
+   * @default ['**\/node_modules\/**', '**\/dist\/**', '**\/*.test.ts', ...]
+   */
+  exclude?: string[];
+}
+
+/**
+ * Extract entities from all TypeScript files in a directory
+ *
+ * @param dir - Directory to scan
+ * @param options - Include/exclude patterns
+ * @returns Array of extracted entities
+ */
+export async function extractEntitiesFromDir(
+  dir: string,
+  options: ExtractOptions = {}
+): Promise<ExtractedEntity[]> {
+  const include = options.include ?? DEFAULT_INCLUDE;
+  const exclude = options.exclude ?? DEFAULT_EXCLUDE;
+
+  const files = await getFilesRecursively(dir, include, exclude, dir);
+  const entities: ExtractedEntity[] = [];
+
+  for (const file of files) {
+    const entity = await extractEntitiesFromFile(file);
+    if (entity) {
+      // Convert absolute path to relative for storage
+      entity.path = relative(dir, file);
+      entities.push(entity);
+    }
+  }
+
+  return entities;
+}

packages/cognitive-context/src/hooks/index.ts

@@ -0,0 +1,7 @@
+/**
+ * Git hooks for Cognitive Context
+ *
+ * @packageDocumentation
+ */
+
+export * from './pre-commit.js';

packages/cognitive-context/src/hooks/pre-commit.ts

@@ -0,0 +1,177 @@
+/**
+ * Pre-commit Hook for Cognitive Context
+ *
+ * Validates cognitive context before commits to ensure documentation stays in sync.
+ */
+
+import { readFile, writeFile, chmod, rm, access } from 'node:fs/promises';
+import { join } from 'node:path';
+import { detectDrift, isStale, isCritical } from '../drift.js';
+import { syncAll } from '../sync.js';
+import { loadConfigOrDefault } from '../config.js';
+import type { KnowledgeGraph, DriftReport } from '../types.js';
+
+// ============================================
+// Types
+// ============================================
+
+export interface PreCommitOptions {
+  blockOnStale?: boolean;  // Block commit if context is stale
+  autoSync?: boolean;      // Auto-sync if drift detected
+  verbose?: boolean;
+}
+
+export interface PreCommitResult {
+  passed: boolean;
+  driftDetected: boolean;
+  filesChanged: number;
+  message: string;
+  recommendation: string;
+}
+
+// ============================================
+// Constants
+// ============================================
+
+const HOOK_SCRIPT = `#!/bin/sh
+# Cognitive Context Pre-commit Hook
+npx cognitive pre-commit
+exit $?
+`;
+
+const COGNITIVE_DIR = '.cognitive';
+const KNOWLEDGE_FILE = 'knowledge.json';
+
+// ============================================
+// Helpers
+// ============================================
+
+async function fileExists(path: string): Promise<boolean> {
+  try { await access(path); return true; } catch { return false; }
+}
+
+async function loadSavedGraph(projectRoot: string): Promise<KnowledgeGraph | null> {
+  try {
+    const content = await readFile(join(projectRoot, COGNITIVE_DIR, KNOWLEDGE_FILE), 'utf-8');
+    return JSON.parse(content) as KnowledgeGraph;
+  } catch { return null; }
+}
+
+function buildRecommendation(report: DriftReport): string {
+  if (report.recommendation === 'regenerate') return 'Run `cognitive extract && cognitive sync`';
+  if (report.recommendation === 'sync') return 'Run `cognitive sync` to update tool files';
+  return 'No action needed';
+}
+
+function buildMessage(report: DriftReport, verbose: boolean): string {
+  if (report.staleness === 'fresh' && report.recommendation === 'none') {
+    return 'Cognitive context is up to date.';
+  }
+  const changes = report.entitiesAdded.length + report.entitiesRemoved.length + report.entitiesModified.length;
+  const lines = [
+    `Cognitive context drift detected:`,
+    `  Status: ${report.staleness}`,
+    `  Files changed: ${report.filesChanged}`,
+    `  Entity changes: ${changes}`,
+  ];
+  if (verbose) {
+    if (report.entitiesAdded.length) lines.push(`  Added: ${report.entitiesAdded.length}`);
+    if (report.entitiesRemoved.length) lines.push(`  Removed: ${report.entitiesRemoved.length}`);
+    if (report.entitiesModified.length) lines.push(`  Modified: ${report.entitiesModified.length}`);
+  }
+  return lines.join('\n');
+}
+
+// ============================================
+// Main Exports
+// ============================================
+
+/**
+ * Run pre-commit validation check
+ */
+export async function runPreCommitCheck(
+  projectRoot: string,
+  options: PreCommitOptions = {}
+): Promise<PreCommitResult> {
+  const { blockOnStale = false, autoSync = false, verbose = false } = options;
+
+  const savedGraph = await loadSavedGraph(projectRoot);
+  if (!savedGraph) {
+    return {
+      passed: true,
+      driftDetected: false,
+      filesChanged: 0,
+      message: 'No cognitive context found. Run `cognitive extract` to initialize.',
+      recommendation: 'Run `cognitive extract && cognitive sync` to set up context',
+    };
+  }
+
+  const report = detectDrift(savedGraph, savedGraph);
+  const driftDetected = isStale(report);
+  const criticallyStale = isCritical(report);
+
+  if (autoSync && driftDetected) {
+    try {
+      const config = await loadConfigOrDefault(projectRoot);
+      const toolConfigs = config.tools.map((t) => ({
+        name: t.name, enabled: t.enabled, outputPath: t.outputPath ?? '',
+      }));
+      await syncAll(projectRoot, toolConfigs, { verbose });
+    } catch { /* continue with warning */ }
+  }
+
+  return {
+    passed: !blockOnStale || !driftDetected || (blockOnStale && !criticallyStale),
+    driftDetected,
+    filesChanged: report.filesChanged,
+    message: buildMessage(report, verbose),
+    recommendation: buildRecommendation(report),
+  };
+}
+
+/**
+ * Format pre-commit result for console output
+ */
+export function formatPreCommitOutput(result: PreCommitResult): string {
+  const icon = result.passed ? '[OK]' : '[BLOCKED]';
+  const lines = [`${icon} Cognitive Context Pre-commit Check`, '', result.message];
+  if (result.driftDetected) lines.push('', `Recommendation: ${result.recommendation}`);
+  if (!result.passed) {
+    lines.push('', 'Commit blocked due to critically stale context.');
+    lines.push('Update context or use --no-verify to skip.');
+  }
+  return lines.join('\n');
+}
+
+/**
+ * Install the pre-commit hook into .git/hooks
+ */
+export async function installHook(projectRoot: string): Promise<void> {
+  const hookPath = join(projectRoot, '.git', 'hooks', 'pre-commit');
+
+  if (!(await fileExists(join(projectRoot, '.git')))) {
+    throw new Error('Not a git repository: .git directory not found');
+  }
+  if (await fileExists(hookPath)) {
+    const content = await readFile(hookPath, 'utf-8');
+    if (content.includes('cognitive')) throw new Error('Cognitive hook already installed');
+    throw new Error('Pre-commit hook exists. Remove it or add cognitive check manually.');
+  }
+
+  await writeFile(hookPath, HOOK_SCRIPT, 'utf-8');
+  await chmod(hookPath, 0o755);
+}
+
+/**
+ * Uninstall the pre-commit hook from .git/hooks
+ */
+export async function uninstallHook(projectRoot: string): Promise<void> {
+  const hookPath = join(projectRoot, '.git', 'hooks', 'pre-commit');
+  if (!(await fileExists(hookPath))) return;
+
+  const content = await readFile(hookPath, 'utf-8');
+  if (!content.includes('cognitive')) {
+    throw new Error('Pre-commit hook was not installed by cognitive-context');
+  }
+  await rm(hookPath);
+}

packages/cognitive-context/src/index.ts

@@ -0,0 +1,34 @@
+/**
+ * Cognitive Context System
+ *
+ * Production-ready context management for AI coding assistants.
+ *
+ * @packageDocumentation
+ */
+
+// Types
+export * from './types.js';
+
+// Configuration
+export * from './config.schema.js';
+export * from './config.js';
+
+// Core modules (to be implemented in Wave 1-3)
+export * from './extractor.js';
+export * from './watcher.js';
+export * from './tokens.js';
+export * from './validator.js';
+export * from './sync.js';
+export * from './drift.js';
+
+// Adapters
+export * from './adapters/index.js';
+
+// Hooks
+export * from './hooks/index.js';
+
+// CLI (exported for programmatic use)
+export { createProgram } from './cli.js';
+
+// Version
+export const VERSION = '0.1.0';

packages/cognitive-context/src/tokens.test.ts

@@ -0,0 +1,374 @@
+/**
+ * Tests for token counting module
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { writeFile, unlink, mkdir, rmdir } from 'node:fs/promises';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+import {
+  countTokens,
+  countFileTokens,
+  validateBudget,
+  truncateToTokenLimit,
+  createTokenReport,
+  getBudgetForFile,
+  formatTokenCount,
+  resetEncoder,
+} from './tokens.js';
+import type { TokenBudget, TokenReport } from './types.js';
+
+// ============================================
+// Test Setup
+// ============================================
+
+describe('tokens', () => {
+  let testDir: string;
+
+  beforeEach(async () => {
+    resetEncoder();
+    testDir = join(tmpdir(), `cognitive-test-${Date.now()}`);
+    await mkdir(testDir, { recursive: true });
+  });
+
+  afterEach(async () => {
+    try {
+      // Clean up test files
+      const files = ['test.txt', 'empty.txt', 'summary.md'];
+      for (const file of files) {
+        try {
+          await unlink(join(testDir, file));
+        } catch {
+          // Ignore if file doesn't exist
+        }
+      }
+      await rmdir(testDir);
+    } catch {
+      // Ignore cleanup errors
+    }
+  });
+
+  // ============================================
+  // countTokens Tests
+  // ============================================
+
+  describe('countTokens', () => {
+    it('should count tokens in a simple string', () => {
+      const text = 'Hello, world!';
+      const count = countTokens(text);
+
+      // cl100k_base tokenizes "Hello, world!" into about 4 tokens
+      expect(count).toBeGreaterThan(0);
+      expect(count).toBeLessThan(10);
+    });
+
+    it('should return 0 for empty string', () => {
+      expect(countTokens('')).toBe(0);
+    });
+
+    it('should return 0 for null/undefined-like input', () => {
+      // @ts-expect-error Testing edge case
+      expect(countTokens(null)).toBe(0);
+      // @ts-expect-error Testing edge case
+      expect(countTokens(undefined)).toBe(0);
+    });
+
+    it('should handle long text', () => {
+      const longText = 'This is a test sentence. '.repeat(100);
+      const count = countTokens(longText);
+
+      // Should be roughly proportional to length
+      expect(count).toBeGreaterThan(100);
+      expect(count).toBeLessThan(1000);
+    });
+
+    it('should handle special characters and unicode', () => {
+      const text = 'Hello! 你好! مرحبا! 🌍';
+      const count = countTokens(text);
+
+      // Should handle unicode without throwing
+      expect(count).toBeGreaterThan(0);
+    });
+
+    it('should handle code snippets', () => {
+      const code = `
+function hello() {
+  console.log("Hello, world!");
+  return 42;
+}
+      `;
+      const count = countTokens(code);
+
+      expect(count).toBeGreaterThan(10);
+    });
+  });
+
+  // ============================================
+  // countFileTokens Tests
+  // ============================================
+
+  describe('countFileTokens', () => {
+    it('should count tokens in a file', async () => {
+      const filePath = join(testDir, 'test.txt');
+      const content = 'This is test content for token counting.';
+      await writeFile(filePath, content, 'utf-8');
+
+      const report = await countFileTokens(filePath, 100);
+
+      expect(report.file).toBe(filePath);
+      expect(report.tokens).toBeGreaterThan(0);
+      expect(report.budget).toBe(100);
+      expect(report.overBudget).toBe(false);
+      expect(report.percentage).toBeLessThan(100);
+    });
+
+    it('should detect when file is over budget', async () => {
+      const filePath = join(testDir, 'test.txt');
+      const content = 'This is a longer test content. '.repeat(50);
+      await writeFile(filePath, content, 'utf-8');
+
+      const report = await countFileTokens(filePath, 10);
+
+      expect(report.overBudget).toBe(true);
+      expect(report.percentage).toBeGreaterThan(100);
+    });
+
+    it('should handle non-existent file gracefully', async () => {
+      const report = await countFileTokens('/non/existent/file.txt', 100);
+
+      expect(report.tokens).toBe(0);
+      expect(report.overBudget).toBe(false);
+    });
+
+    it('should handle empty file', async () => {
+      const filePath = join(testDir, 'empty.txt');
+      await writeFile(filePath, '', 'utf-8');
+
+      const report = await countFileTokens(filePath, 100);
+
+      expect(report.tokens).toBe(0);
+      expect(report.overBudget).toBe(false);
+      expect(report.percentage).toBe(0);
+    });
+
+    it('should use Infinity as default budget', async () => {
+      const filePath = join(testDir, 'test.txt');
+      await writeFile(filePath, 'Some content', 'utf-8');
+
+      const report = await countFileTokens(filePath);
+
+      expect(report.budget).toBe(Infinity);
+      expect(report.overBudget).toBe(false);
+      expect(report.percentage).toBe(0);
+    });
+  });
+
+  // ============================================
+  // validateBudget Tests
+  // ============================================
+
+  describe('validateBudget', () => {
+    const defaultBudget: TokenBudget = {
+      summary: 300,
+      capabilities: 2000,
+      wisdomPerFile: 1500,
+      total: 5000,
+    };
+
+    it('should return valid when all reports are within budget', () => {
+      const reports: TokenReport[] = [
+        { file: 'SUMMARY.md', tokens: 200, budget: 300, overBudget: false, percentage: 67 },
+        { file: 'capabilities.yaml', tokens: 1000, budget: 2000, overBudget: false, percentage: 50 },
+      ];
+
+      const result = validateBudget(reports, defaultBudget);
+
+      expect(result.valid).toBe(true);
+      expect(result.violations).toHaveLength(0);
+    });
+
+    it('should detect individual file budget violations', () => {
+      const reports: TokenReport[] = [
+        { file: 'SUMMARY.md', tokens: 400, budget: 300, overBudget: true, percentage: 133 },
+        { file: 'capabilities.yaml', tokens: 1000, budget: 2000, overBudget: false, percentage: 50 },
+      ];
+
+      const result = validateBudget(reports, defaultBudget);
+
+      expect(result.valid).toBe(false);
+      expect(result.violations).toHaveLength(1);
+      expect(result.violations[0].file).toBe('SUMMARY.md');
+    });
+
+    it('should detect total budget violations', () => {
+      const reports: TokenReport[] = [
+        { file: 'file1.md', tokens: 3000, budget: 5000, overBudget: false, percentage: 60 },
+        { file: 'file2.md', tokens: 3000, budget: 5000, overBudget: false, percentage: 60 },
+      ];
+
+      const result = validateBudget(reports, defaultBudget);
+
+      expect(result.valid).toBe(false);
+      // Should have total violation
+      const totalViolation = result.violations.find((v) => v.file === '[TOTAL]');
+      expect(totalViolation).toBeDefined();
+      expect(totalViolation?.tokens).toBe(6000);
+    });
+
+    it('should handle empty reports array', () => {
+      const result = validateBudget([], defaultBudget);
+
+      expect(result.valid).toBe(true);
+      expect(result.violations).toHaveLength(0);
+    });
+
+    it('should detect multiple violations', () => {
+      const reports: TokenReport[] = [
+        { file: 'SUMMARY.md', tokens: 500, budget: 300, overBudget: true, percentage: 167 },
+        { file: 'wisdom/guide.md', tokens: 2000, budget: 1500, overBudget: true, percentage: 133 },
+      ];
+
+      const result = validateBudget(reports, defaultBudget);
+
+      expect(result.valid).toBe(false);
+      expect(result.violations.length).toBeGreaterThanOrEqual(2);
+    });
+  });
+
+  // ============================================
+  // truncateToTokenLimit Tests
+  // ============================================
+
+  describe('truncateToTokenLimit', () => {
+    it('should return text unchanged if within limit', () => {
+      const text = 'Hello, world!';
+      const result = truncateToTokenLimit(text, 100);
+
+      expect(result).toBe(text);
+    });
+
+    it('should truncate text to fit within limit', () => {
+      const text = 'This is a test sentence. '.repeat(100);
+      const result = truncateToTokenLimit(text, 50);
+
+      const resultTokens = countTokens(result);
+      expect(resultTokens).toBeLessThanOrEqual(50);
+      expect(result.length).toBeLessThan(text.length);
+    });
+
+    it('should return empty string for empty input', () => {
+      expect(truncateToTokenLimit('', 100)).toBe('');
+    });
+
+    it('should return empty string for zero max tokens', () => {
+      expect(truncateToTokenLimit('Hello', 0)).toBe('');
+    });
+
+    it('should return empty string for negative max tokens', () => {
+      expect(truncateToTokenLimit('Hello', -10)).toBe('');
+    });
+
+    it('should try to break at sentence boundaries', () => {
+      const text = 'First sentence. Second sentence. Third sentence.';
+      const result = truncateToTokenLimit(text, 8);
+
+      // Should end with a period if it found a sentence boundary
+      if (result.length > 10) {
+        expect(result.endsWith('.') || result.endsWith('sentence')).toBe(true);
+      }
+    });
+
+    it('should handle single word exceeding limit', () => {
+      const text = 'supercalifragilisticexpialidocious';
+      const result = truncateToTokenLimit(text, 1);
+
+      // Should still return something (partial word)
+      expect(countTokens(result)).toBeLessThanOrEqual(1);
+    });
+  });
+
+  // ============================================
+  // createTokenReport Tests
+  // ============================================
+
+  describe('createTokenReport', () => {
+    it('should create a report with correct values', () => {
+      const report = createTokenReport('test.md', 'Hello world', 100);
+
+      expect(report.file).toBe('test.md');
+      expect(report.tokens).toBeGreaterThan(0);
+      expect(report.budget).toBe(100);
+      expect(report.overBudget).toBe(false);
+      expect(report.percentage).toBeLessThan(100);
+    });
+
+    it('should detect over budget content', () => {
+      const content = 'This is content. '.repeat(100);
+      const report = createTokenReport('test.md', content, 10);
+
+      expect(report.overBudget).toBe(true);
+      expect(report.percentage).toBeGreaterThan(100);
+    });
+
+    it('should handle zero budget', () => {
+      const report = createTokenReport('test.md', 'content', 0);
+
+      expect(report.percentage).toBe(0);
+    });
+  });
+
+  // ============================================
+  // getBudgetForFile Tests
+  // ============================================
+
+  describe('getBudgetForFile', () => {
+    const budget: TokenBudget = {
+      summary: 300,
+      capabilities: 2000,
+      wisdomPerFile: 1500,
+      total: 20000,
+    };
+
+    it('should return summary budget for summary files', () => {
+      expect(getBudgetForFile('SUMMARY.md', budget)).toBe(300);
+      expect(getBudgetForFile('.context/SUMMARY.md', budget)).toBe(300);
+      expect(getBudgetForFile('docs/summary.txt', budget)).toBe(300);
+    });
+
+    it('should return capabilities budget for capabilities files', () => {
+      expect(getBudgetForFile('capabilities.yaml', budget)).toBe(2000);
+      expect(getBudgetForFile('.context/capabilities.yml', budget)).toBe(2000);
+    });
+
+    it('should return wisdom budget for wisdom files', () => {
+      expect(getBudgetForFile('wisdom/guide.md', budget)).toBe(1500);
+      expect(getBudgetForFile('.context/wisdom/patterns.md', budget)).toBe(1500);
+    });
+
+    it('should return total budget for unknown files', () => {
+      expect(getBudgetForFile('random.md', budget)).toBe(20000);
+      expect(getBudgetForFile('docs/other.txt', budget)).toBe(20000);
+    });
+  });
+
+  // ============================================
+  // formatTokenCount Tests
+  // ============================================
+
+  describe('formatTokenCount', () => {
+    it('should format small numbers as-is', () => {
+      expect(formatTokenCount(100)).toBe('100');
+      expect(formatTokenCount(999)).toBe('999');
+    });
+
+    it('should format thousands with k suffix', () => {
+      expect(formatTokenCount(1000)).toBe('1.0k');
+      expect(formatTokenCount(1500)).toBe('1.5k');
+      expect(formatTokenCount(10000)).toBe('10.0k');
+    });
+
+    it('should handle zero', () => {
+      expect(formatTokenCount(0)).toBe('0');
+    });
+  });
+});

packages/cognitive-context/src/tokens.ts

@@ -0,0 +1,306 @@
+/**
+ * Token counting and budget management module
+ *
+ * Uses js-tiktoken with cl100k_base encoding (GPT-4 compatible)
+ * for accurate token counting.
+ */
+
+import { readFile } from 'node:fs/promises';
+import { getEncoding, Tiktoken } from 'js-tiktoken';
+import type { TokenBudget, TokenReport } from './types.js';
+
+// ============================================
+// Encoder Instance (cached for performance)
+// ============================================
+
+let encoderInstance: Tiktoken | null = null;
+
+/**
+ * Get or create the tiktoken encoder instance
+ * Uses cl100k_base encoding (GPT-4/ChatGPT compatible)
+ */
+function getEncoder(): Tiktoken {
+  if (!encoderInstance) {
+    encoderInstance = getEncoding('cl100k_base');
+  }
+  return encoderInstance;
+}
+
+// ============================================
+// Core Token Counting
+// ============================================
+
+/**
+ * Count the number of tokens in a text string
+ *
+ * @param text - The text to count tokens for
+ * @returns The number of tokens
+ *
+ * @example
+ * const count = countTokens('Hello, world!');
+ * console.log(count); // 4
+ */
+export function countTokens(text: string): number {
+  if (!text || text.length === 0) {
+    return 0;
+  }
+
+  try {
+    const encoder = getEncoder();
+    const tokens = encoder.encode(text);
+    return tokens.length;
+  } catch (error) {
+    // Handle encoding errors gracefully - estimate based on characters
+    // Rough estimate: ~4 characters per token for English text
+    console.warn('Token encoding failed, using character-based estimate:', error);
+    return Math.ceil(text.length / 4);
+  }
+}
+
+/**
+ * Count tokens in a file
+ *
+ * @param filePath - Path to the file to count tokens for
+ * @param budget - Optional budget to compare against (defaults to Infinity)
+ * @returns TokenReport with file statistics
+ *
+ * @example
+ * const report = await countFileTokens('./README.md', 1000);
+ * console.log(report.overBudget); // false if under 1000 tokens
+ */
+export async function countFileTokens(
+  filePath: string,
+  budget: number = Infinity
+): Promise<TokenReport> {
+  try {
+    const content = await readFile(filePath, 'utf-8');
+    const tokens = countTokens(content);
+
+    return {
+      file: filePath,
+      tokens,
+      budget,
+      overBudget: tokens > budget,
+      percentage: budget === Infinity ? 0 : Math.round((tokens / budget) * 100),
+    };
+  } catch (error) {
+    // If file can't be read, return a report indicating the error
+    // with 0 tokens (can't count what we can't read)
+    const message = error instanceof Error ? error.message : 'Unknown error';
+    console.warn(`Failed to read file ${filePath}: ${message}`);
+
+    return {
+      file: filePath,
+      tokens: 0,
+      budget,
+      overBudget: false,
+      percentage: 0,
+    };
+  }
+}
+
+// ============================================
+// Budget Validation
+// ============================================
+
+/**
+ * Validate token reports against a budget configuration
+ *
+ * @param reports - Array of TokenReport objects to validate
+ * @param budget - TokenBudget configuration with limits
+ * @returns Validation result with valid flag and any violations
+ *
+ * @example
+ * const reports = [
+ *   { file: 'SUMMARY.md', tokens: 250, budget: 300, overBudget: false, percentage: 83 },
+ *   { file: 'wisdom/guide.md', tokens: 2000, budget: 1500, overBudget: true, percentage: 133 },
+ * ];
+ * const result = validateBudget(reports, budget);
+ * console.log(result.valid); // false
+ * console.log(result.violations); // [{ file: 'wisdom/guide.md', ... }]
+ */
+export function validateBudget(
+  reports: TokenReport[],
+  budget: TokenBudget
+): { valid: boolean; violations: TokenReport[] } {
+  const violations: TokenReport[] = [];
+
+  // Check individual file budgets
+  for (const report of reports) {
+    if (report.overBudget) {
+      violations.push(report);
+    }
+  }
+
+  // Check total budget
+  const totalTokens = reports.reduce((sum, r) => sum + r.tokens, 0);
+  if (totalTokens > budget.total) {
+    // Add a synthetic report for total budget violation
+    violations.push({
+      file: '[TOTAL]',
+      tokens: totalTokens,
+      budget: budget.total,
+      overBudget: true,
+      percentage: Math.round((totalTokens / budget.total) * 100),
+    });
+  }
+
+  return {
+    valid: violations.length === 0,
+    violations,
+  };
+}
+
+// ============================================
+// Text Truncation
+// ============================================
+
+/**
+ * Truncate text to fit within a token limit
+ *
+ * Preserves complete words/sentences when possible by truncating
+ * at sentence or word boundaries.
+ *
+ * @param text - The text to truncate
+ * @param maxTokens - Maximum number of tokens allowed
+ * @returns Truncated text that fits within the limit
+ *
+ * @example
+ * const longText = 'This is a very long text...';
+ * const truncated = truncateToTokenLimit(longText, 10);
+ * console.log(countTokens(truncated) <= 10); // true
+ */
+export function truncateToTokenLimit(text: string, maxTokens: number): string {
+  if (!text || maxTokens <= 0) {
+    return '';
+  }
+
+  const currentTokens = countTokens(text);
+  if (currentTokens <= maxTokens) {
+    return text;
+  }
+
+  // Binary search for the right length
+  // Start with an estimate based on the ratio
+  const ratio = maxTokens / currentTokens;
+  let low = 0;
+  let high = text.length;
+  let result = '';
+
+  // Initial estimate
+  let mid = Math.floor(text.length * ratio * 0.9); // Start slightly under
+
+  // Refine with binary search
+  while (low < high) {
+    mid = Math.floor((low + high + 1) / 2);
+    const substring = text.slice(0, mid);
+    const tokens = countTokens(substring);
+
+    if (tokens <= maxTokens) {
+      result = substring;
+      low = mid;
+    } else {
+      high = mid - 1;
+    }
+  }
+
+  // Try to find a clean break point (sentence or word boundary)
+  const cleanBreak = findCleanBreakPoint(result);
+
+  return cleanBreak || result;
+}
+
+/**
+ * Find a clean break point in text (sentence or word boundary)
+ */
+function findCleanBreakPoint(text: string): string {
+  if (!text) return '';
+
+  // Try to find the last sentence boundary
+  const sentenceMatch = text.match(/^(.+[.!?])\s*[^.!?]*$/);
+  if (sentenceMatch && sentenceMatch[1].length > text.length * 0.7) {
+    return sentenceMatch[1];
+  }
+
+  // Fall back to last word boundary
+  const wordMatch = text.match(/^(.+)\s+\S*$/);
+  if (wordMatch && wordMatch[1].length > text.length * 0.8) {
+    return wordMatch[1];
+  }
+
+  // If no good break point, return as-is
+  return text;
+}
+
+// ============================================
+// Utility Functions
+// ============================================
+
+/**
+ * Create a TokenReport for a given file path and content
+ *
+ * @param file - File path
+ * @param content - File content
+ * @param budget - Token budget for this file
+ * @returns TokenReport
+ */
+export function createTokenReport(
+  file: string,
+  content: string,
+  budget: number
+): TokenReport {
+  const tokens = countTokens(content);
+  return {
+    file,
+    tokens,
+    budget,
+    overBudget: tokens > budget,
+    percentage: budget > 0 ? Math.round((tokens / budget) * 100) : 0,
+  };
+}
+
+/**
+ * Get budget for a specific file type based on TokenBudget config
+ *
+ * @param filePath - The file path
+ * @param budget - TokenBudget configuration
+ * @returns The applicable budget for this file
+ */
+export function getBudgetForFile(filePath: string, budget: TokenBudget): number {
+  const lowerPath = filePath.toLowerCase();
+
+  if (lowerPath.includes('summary')) {
+    return budget.summary;
+  }
+
+  if (lowerPath.includes('capabilities')) {
+    return budget.capabilities;
+  }
+
+  if (lowerPath.includes('wisdom')) {
+    return budget.wisdomPerFile;
+  }
+
+  // Default to total budget if no specific category matches
+  return budget.total;
+}
+
+/**
+ * Format a token count for display
+ *
+ * @param tokens - Number of tokens
+ * @returns Formatted string (e.g., "1.2k" for 1200)
+ */
+export function formatTokenCount(tokens: number): string {
+  if (tokens >= 1000) {
+    return `${(tokens / 1000).toFixed(1)}k`;
+  }
+  return tokens.toString();
+}
+
+/**
+ * Reset the encoder instance (useful for testing)
+ */
+export function resetEncoder(): void {
+  encoderInstance = null;
+}

packages/cognitive-context/src/types.ts

@@ -0,0 +1,244 @@
+/**
+ * Core type definitions for the Cognitive Context System
+ *
+ * This file defines all shared types used across the system.
+ */
+
+// ============================================
+// Entity Extraction Types
+// ============================================
+
+export type EntityType =
+  | 'component'
+  | 'hook'
+  | 'utility'
+  | 'type'
+  | 'interface'
+  | 'schema'
+  | 'endpoint'
+  | 'module';
+
+export interface ExtractedExport {
+  name: string;
+  kind: 'function' | 'class' | 'const' | 'type' | 'interface' | 'enum';
+  isDefault: boolean;
+  line: number;
+}
+
+export interface ExtractedImport {
+  source: string;
+  specifiers: string[];
+  isRelative: boolean;
+}
+
+export interface ExtractedEntity {
+  /** Entity name (primary export) */
+  name: string;
+  /** File path relative to project root */
+  path: string;
+  /** Entity type classification */
+  type: EntityType;
+  /** All exports from the file */
+  exports: ExtractedExport[];
+  /** All imports (for dependency tracking) */
+  imports: ExtractedImport[];
+  /** Props interface (for components) */
+  props?: PropDefinition[];
+  /** Last modified timestamp */
+  modifiedAt: Date;
+  /** File hash for change detection */
+  hash: string;
+}
+
+export interface PropDefinition {
+  name: string;
+  type: string;
+  required: boolean;
+  defaultValue?: string;
+  description?: string;
+}
+
+// ============================================
+// Knowledge Graph Types
+// ============================================
+
+export interface KnowledgeGraph {
+  meta: KnowledgeMeta;
+  entities: Record<string, ExtractedEntity>;
+  relationships: EntityRelationship[];
+}
+
+export interface KnowledgeMeta {
+  generatedAt: string;
+  fromCommit: string;
+  totalEntities: number;
+  projectRoot: string;
+  version: string;
+}
+
+export interface EntityRelationship {
+  from: string;
+  to: string;
+  type: 'imports' | 'extends' | 'implements' | 'uses';
+}
+
+// ============================================
+// Validation Types
+// ============================================
+
+export interface ValidationResult {
+  /** Overall completeness score (0-100) */
+  score: number;
+  /** Entities in code but not documented */
+  missing: string[];
+  /** Entities documented but not in code */
+  stale: string[];
+  /** Warnings (non-blocking) */
+  warnings: ValidationWarning[];
+  /** Suggestions for improvement */
+  suggestions: string[];
+  /** Validation timestamp */
+  validatedAt: Date;
+}
+
+export interface ValidationWarning {
+  type: 'low-confidence' | 'outdated' | 'incomplete';
+  entity: string;
+  message: string;
+}
+
+// ============================================
+// Drift Detection Types
+// ============================================
+
+export type StalenessLevel = 'fresh' | 'stale' | 'critical';
+
+export interface DriftReport {
+  /** Number of files changed since last sync */
+  filesChanged: number;
+  /** New entities detected */
+  entitiesAdded: string[];
+  /** Entities removed from code */
+  entitiesRemoved: string[];
+  /** Entities modified */
+  entitiesModified: string[];
+  /** Last sync timestamp */
+  lastSync: Date;
+  /** Staleness classification */
+  staleness: StalenessLevel;
+  /** Recommended action */
+  recommendation: 'none' | 'sync' | 'regenerate';
+}
+
+// ============================================
+// Token Budgeting Types
+// ============================================
+
+export interface TokenBudget {
+  /** Maximum tokens for SUMMARY.md */
+  summary: number;
+  /** Maximum tokens for capabilities.yaml */
+  capabilities: number;
+  /** Maximum tokens per wisdom file */
+  wisdomPerFile: number;
+  /** Total budget across all files */
+  total: number;
+}
+
+export interface TokenReport {
+  file: string;
+  tokens: number;
+  budget: number;
+  overBudget: boolean;
+  percentage: number;
+}
+
+// ============================================
+// Configuration Types
+// ============================================
+
+export interface CognitiveConfig {
+  /** Project root directory */
+  projectRoot: string;
+  /** Source directories to scan */
+  sourceDirs: string[];
+  /** File patterns to include */
+  includePatterns: string[];
+  /** Patterns to exclude */
+  excludePatterns: string[];
+  /** Token budgets */
+  tokenBudget: TokenBudget;
+  /** Target tools to sync */
+  tools: ToolConfig[];
+  /** Watch mode settings */
+  watch: WatchConfig;
+}
+
+export interface ToolConfig {
+  name: 'cursor' | 'claude' | 'continue' | 'aider' | 'copilot' | 'windsurf';
+  enabled: boolean;
+  outputPath: string;
+}
+
+export interface WatchConfig {
+  enabled: boolean;
+  debounceMs: number;
+  ignorePaths: string[];
+}
+
+// ============================================
+// Sync Types
+// ============================================
+
+export interface SyncResult {
+  tool: string;
+  filesWritten: string[];
+  filesDeleted: string[];
+  success: boolean;
+  error?: string;
+}
+
+export interface SyncReport {
+  timestamp: Date;
+  results: SyncResult[];
+  totalFilesWritten: number;
+  totalFilesDeleted: number;
+  allSuccessful: boolean;
+}
+
+// ============================================
+// CLI Types
+// ============================================
+
+export interface CLIContext {
+  config: CognitiveConfig;
+  projectRoot: string;
+  verbose: boolean;
+}
+
+export type CLICommand =
+  | 'init'
+  | 'extract'
+  | 'validate'
+  | 'sync'
+  | 'watch'
+  | 'drift'
+  | 'status';
+
+// ============================================
+// Event Types (for watcher)
+// ============================================
+
+export type FileEventType = 'add' | 'change' | 'unlink';
+
+export interface FileEvent {
+  type: FileEventType;
+  path: string;
+  timestamp: Date;
+}
+
+export interface WatcherCallbacks {
+  onFileChange?: (event: FileEvent) => void;
+  onEntityChange?: (entity: ExtractedEntity, changeType: 'added' | 'modified' | 'removed') => void;
+  onError?: (error: Error) => void;
+}

packages/cognitive-context/src/validator.ts

@@ -0,0 +1,597 @@
+/**
+ * Completeness Validator
+ *
+ * Validates that documented capabilities match extracted code entities.
+ * Ensures the knowledge graph stays in sync with actual code.
+ */
+
+import { readFile } from 'node:fs/promises';
+import { parse as parseYaml } from 'yaml';
+import type {
+  KnowledgeGraph,
+  ValidationResult,
+  ValidationWarning,
+  EntityType,
+} from './types.js';
+
+// ============================================
+// Types
+// ============================================
+
+/**
+ * Represents a single capability entry in the YAML file
+ */
+export interface CapabilityEntry {
+  /** The file path or package reference */
+  path: string;
+  /** Original key in the YAML (e.g., 'line', 'bar') */
+  key: string;
+  /** Full qualified path (e.g., 'ui_components.charts.line') */
+  qualifiedPath: string;
+  /** Inferred entity type */
+  type?: EntityType;
+}
+
+/**
+ * Parsed capabilities.yaml structure
+ */
+export interface DocumentedCapabilities {
+  /** Flattened list of all capability entries */
+  entries: CapabilityEntry[];
+  /** Raw YAML structure for reference */
+  raw: Record<string, unknown>;
+  /** Top-level categories found */
+  categories: string[];
+  /** File path this was loaded from */
+  sourcePath?: string;
+}
+
+/**
+ * Options for validation
+ */
+export interface ValidateOptions {
+  /**
+   * Minimum confidence score to consider an entity match (0-100)
+   * @default 80
+   */
+  minConfidence?: number;
+
+  /**
+   * Whether to include warnings for partial matches
+   * @default true
+   */
+  includePartialMatches?: boolean;
+
+  /**
+   * Categories to skip during validation
+   * @default ['framework', 'packages_available', 'patterns']
+   */
+  skipCategories?: string[];
+
+  /**
+   * Whether to be strict about entity type matching
+   * @default false
+   */
+  strictTypeMatching?: boolean;
+}
+
+// ============================================
+// Constants
+// ============================================
+
+const DEFAULT_OPTIONS: Required<ValidateOptions> = {
+  minConfidence: 80,
+  includePartialMatches: true,
+  skipCategories: ['framework', 'packages_available', 'patterns', 'data_models'],
+  strictTypeMatching: false,
+};
+
+/**
+ * Categories that typically contain code entities (for future use in auto-categorization)
+ */
+const _CODE_CATEGORIES = ['ui_components', 'hooks', 'utilities', 'schemas', 'api'];
+void _CODE_CATEGORIES; // Reserved for future use
+
+// ============================================
+// Helper Functions
+// ============================================
+
+/**
+ * Flatten a nested YAML object into capability entries
+ */
+function flattenCapabilities(
+  obj: unknown,
+  parentPath: string = '',
+  entries: CapabilityEntry[] = []
+): CapabilityEntry[] {
+  if (obj === null || obj === undefined) {
+    return entries;
+  }
+
+  if (typeof obj === 'string') {
+    // Leaf node - this is a file path
+    const key = parentPath.split('.').pop() || parentPath;
+    entries.push({
+      path: obj,
+      key,
+      qualifiedPath: parentPath,
+      type: inferEntityType(parentPath, obj),
+    });
+    return entries;
+  }
+
+  if (typeof obj === 'object' && !Array.isArray(obj)) {
+    for (const [key, value] of Object.entries(obj as Record<string, unknown>)) {
+      // Skip keys that start with underscore (metadata like _docs)
+      if (key.startsWith('_')) {
+        continue;
+      }
+
+      const newPath = parentPath ? `${parentPath}.${key}` : key;
+      flattenCapabilities(value, newPath, entries);
+    }
+  }
+
+  if (Array.isArray(obj)) {
+    // Arrays in capabilities are typically lists of items, not file paths
+    // Skip them for validation purposes
+    return entries;
+  }
+
+  return entries;
+}
+
+/**
+ * Infer entity type from the qualified path and file path
+ */
+function inferEntityType(qualifiedPath: string, filePath: string): EntityType | undefined {
+  const pathLower = qualifiedPath.toLowerCase();
+  const filePathLower = filePath.toLowerCase();
+
+  if (pathLower.includes('component') || pathLower.includes('ui_components')) {
+    return 'component';
+  }
+  if (pathLower.includes('hook') || filePathLower.includes('use')) {
+    return 'hook';
+  }
+  if (pathLower.includes('schema') || filePathLower.includes('schema')) {
+    return 'schema';
+  }
+  if (pathLower.includes('api') || pathLower.includes('endpoint')) {
+    return 'endpoint';
+  }
+  if (pathLower.includes('util') || pathLower.includes('helper')) {
+    return 'utility';
+  }
+
+  return undefined;
+}
+
+/**
+ * Extract entity name from a file path
+ */
+function extractEntityName(filePath: string): string {
+  // Handle paths like 'liquid-render/components/data-table.tsx'
+  const parts = filePath.split('/');
+  const fileName = parts[parts.length - 1];
+
+  // Remove extension
+  const nameWithoutExt = fileName.replace(/\.(tsx?|jsx?|js)$/, '');
+
+  // Convert kebab-case to PascalCase for components
+  return nameWithoutExt
+    .split('-')
+    .map(part => part.charAt(0).toUpperCase() + part.slice(1))
+    .join('');
+}
+
+/**
+ * Normalize an entity name for comparison
+ */
+function normalizeEntityName(name: string): string {
+  return name
+    .toLowerCase()
+    // Remove common prefixes/suffixes
+    .replace(/^(use|get|set|is|has)/, '')
+    .replace(/(component|hook|util|helper|schema)$/, '')
+    // Convert any case to lowercase
+    .replace(/([A-Z])/g, '-$1')
+    .replace(/^-/, '')
+    .replace(/-+/g, '-');
+}
+
+/**
+ * Calculate similarity between two strings (0-100)
+ */
+function calculateSimilarity(str1: string, str2: string): number {
+  const s1 = normalizeEntityName(str1);
+  const s2 = normalizeEntityName(str2);
+
+  if (s1 === s2) return 100;
+
+  // Check if one contains the other
+  if (s1.includes(s2) || s2.includes(s1)) {
+    const longer = s1.length > s2.length ? s1 : s2;
+    const shorter = s1.length > s2.length ? s2 : s1;
+    return Math.round((shorter.length / longer.length) * 100);
+  }
+
+  // Levenshtein distance-based similarity
+  const matrix: number[][] = [];
+  const n = s1.length;
+  const m = s2.length;
+
+  if (n === 0) return m === 0 ? 100 : 0;
+  if (m === 0) return 0;
+
+  for (let i = 0; i <= n; i++) {
+    matrix[i] = [i];
+  }
+  for (let j = 0; j <= m; j++) {
+    matrix[0][j] = j;
+  }
+
+  for (let i = 1; i <= n; i++) {
+    for (let j = 1; j <= m; j++) {
+      const cost = s1[i - 1] === s2[j - 1] ? 0 : 1;
+      matrix[i][j] = Math.min(
+        matrix[i - 1][j] + 1,
+        matrix[i][j - 1] + 1,
+        matrix[i - 1][j - 1] + cost
+      );
+    }
+  }
+
+  const maxLen = Math.max(n, m);
+  const distance = matrix[n][m];
+  return Math.round(((maxLen - distance) / maxLen) * 100);
+}
+
+/**
+ * Find the best matching documented entity for a code entity
+ */
+function findBestMatch(
+  entityName: string,
+  documentedEntries: CapabilityEntry[],
+  minConfidence: number
+): { entry: CapabilityEntry; confidence: number } | null {
+  let bestMatch: { entry: CapabilityEntry; confidence: number } | null = null;
+
+  for (const entry of documentedEntries) {
+    const documentedName = extractEntityName(entry.path);
+    const similarity = calculateSimilarity(entityName, documentedName);
+
+    // Also check the key itself
+    const keySimilarity = calculateSimilarity(entityName, entry.key);
+    const maxSimilarity = Math.max(similarity, keySimilarity);
+
+    if (maxSimilarity >= minConfidence) {
+      if (!bestMatch || maxSimilarity > bestMatch.confidence) {
+        bestMatch = { entry, confidence: maxSimilarity };
+      }
+    }
+  }
+
+  return bestMatch;
+}
+
+/**
+ * Calculate the completeness score
+ */
+function calculateScore(
+  totalEntities: number,
+  missingCount: number,
+  staleCount: number
+): number {
+  if (totalEntities === 0) {
+    return 100; // Nothing to validate
+  }
+
+  const issueCount = missingCount + staleCount;
+  const score = 100 - (issueCount / totalEntities) * 100;
+
+  return Math.max(0, Math.min(100, Math.round(score)));
+}
+
+/**
+ * Generate suggestions based on validation findings
+ */
+function generateSuggestions(
+  missing: string[],
+  stale: string[],
+  warnings: ValidationWarning[]
+): string[] {
+  const suggestions: string[] = [];
+
+  if (missing.length > 0) {
+    if (missing.length <= 3) {
+      suggestions.push(
+        `Add documentation for: ${missing.join(', ')}`
+      );
+    } else {
+      suggestions.push(
+        `Add documentation for ${missing.length} undocumented entities (run with --verbose for full list)`
+      );
+    }
+  }
+
+  if (stale.length > 0) {
+    if (stale.length <= 3) {
+      suggestions.push(
+        `Remove or update stale entries: ${stale.join(', ')}`
+      );
+    } else {
+      suggestions.push(
+        `Clean up ${stale.length} stale documentation entries`
+      );
+    }
+  }
+
+  const lowConfidenceWarnings = warnings.filter(w => w.type === 'low-confidence');
+  if (lowConfidenceWarnings.length > 0) {
+    suggestions.push(
+      'Review entities with low-confidence matches - names may have drifted'
+    );
+  }
+
+  const incompleteWarnings = warnings.filter(w => w.type === 'incomplete');
+  if (incompleteWarnings.length > 0) {
+    suggestions.push(
+      'Some documented entries reference files that could not be verified'
+    );
+  }
+
+  if (suggestions.length === 0) {
+    suggestions.push('Documentation is complete and up-to-date!');
+  }
+
+  return suggestions;
+}
+
+/**
+ * Check if a category should be validated (contains code references)
+ */
+function shouldValidateCategory(category: string, skipCategories: string[]): boolean {
+  return !skipCategories.includes(category);
+}
+
+// ============================================
+// YAML Parsing
+// ============================================
+
+/**
+ * Parse a capabilities YAML file into structured format
+ */
+export function parseCapabilitiesYaml(
+  content: string,
+  sourcePath?: string
+): DocumentedCapabilities {
+  const raw = parseYaml(content) as Record<string, unknown>;
+  const categories = Object.keys(raw).filter(k => !k.startsWith('_'));
+  const entries = flattenCapabilities(raw);
+
+  return {
+    entries,
+    raw,
+    categories,
+    sourcePath,
+  };
+}
+
+/**
+ * Load and parse a capabilities.yaml file
+ */
+export async function loadCapabilitiesFile(
+  filePath: string
+): Promise<DocumentedCapabilities> {
+  try {
+    const content = await readFile(filePath, 'utf-8');
+    return parseCapabilitiesYaml(content, filePath);
+  } catch (error) {
+    if ((error as NodeJS.ErrnoException).code === 'ENOENT') {
+      // File doesn't exist - return empty capabilities
+      return {
+        entries: [],
+        raw: {},
+        categories: [],
+        sourcePath: filePath,
+      };
+    }
+    throw new Error(
+      `Failed to load capabilities file: ${error instanceof Error ? error.message : String(error)}`
+    );
+  }
+}
+
+// ============================================
+// Main Validation Functions
+// ============================================
+
+/**
+ * Validate that documented capabilities match the knowledge graph
+ *
+ * @param knowledgeGraph - Extracted entities from code
+ * @param documentedCapabilities - Parsed capabilities.yaml content
+ * @param options - Validation options
+ * @returns Validation result with score, missing/stale entities, and suggestions
+ */
+export function validateCompleteness(
+  knowledgeGraph: KnowledgeGraph,
+  documentedCapabilities: DocumentedCapabilities,
+  options: ValidateOptions = {}
+): ValidationResult {
+  const opts = { ...DEFAULT_OPTIONS, ...options };
+  const missing: string[] = [];
+  const stale: string[] = [];
+  const warnings: ValidationWarning[] = [];
+
+  // Get entities from the knowledge graph
+  const codeEntities = Object.values(knowledgeGraph.entities);
+
+  // Filter documented entries to only include code-relevant categories
+  const codeRelatedEntries = documentedCapabilities.entries.filter(entry => {
+    const category = entry.qualifiedPath.split('.')[0];
+    return shouldValidateCategory(category, opts.skipCategories);
+  });
+
+  // Track which documented entries have been matched
+  const matchedDocumentedEntries = new Set<string>();
+  const matchedCodeEntities = new Set<string>();
+
+  // Check each code entity against documentation
+  for (const entity of codeEntities) {
+    const match = findBestMatch(entity.name, codeRelatedEntries, opts.minConfidence);
+
+    if (match) {
+      matchedDocumentedEntries.add(match.entry.qualifiedPath);
+      matchedCodeEntities.add(entity.name);
+
+      // Add warning for low-confidence matches
+      if (match.confidence < 100 && match.confidence >= opts.minConfidence) {
+        warnings.push({
+          type: 'low-confidence',
+          entity: entity.name,
+          message: `Matched to '${match.entry.qualifiedPath}' with ${match.confidence}% confidence`,
+        });
+      }
+
+      // Check type mismatch if strict matching is enabled
+      if (opts.strictTypeMatching && match.entry.type && match.entry.type !== entity.type) {
+        warnings.push({
+          type: 'incomplete',
+          entity: entity.name,
+          message: `Type mismatch: documented as '${match.entry.type}', code is '${entity.type}'`,
+        });
+      }
+    } else {
+      // Entity in code but not documented
+      missing.push(entity.name);
+    }
+  }
+
+  // Find stale documentation (documented but not in code)
+  for (const entry of codeRelatedEntries) {
+    if (!matchedDocumentedEntries.has(entry.qualifiedPath)) {
+      // Check if the path contains a package reference (not a file path)
+      const isPackageRef = entry.path.startsWith('@') || !entry.path.includes('/');
+
+      if (!isPackageRef) {
+        stale.push(entry.qualifiedPath);
+        warnings.push({
+          type: 'outdated',
+          entity: entry.qualifiedPath,
+          message: `Documented entry '${entry.path}' not found in extracted code`,
+        });
+      }
+    }
+  }
+
+  // Calculate total entities for scoring
+  // Consider both documented and code entities
+  const totalEntities = new Set([
+    ...codeEntities.map(e => e.name),
+    ...codeRelatedEntries.map(e => e.qualifiedPath),
+  ]).size;
+
+  const score = calculateScore(totalEntities, missing.length, stale.length);
+  const suggestions = generateSuggestions(missing, stale, warnings);
+
+  return {
+    score,
+    missing,
+    stale,
+    warnings,
+    suggestions,
+    validatedAt: new Date(),
+  };
+}
+
+/**
+ * Validate a capabilities file against a knowledge graph
+ *
+ * Convenience function that loads the capabilities file and runs validation.
+ *
+ * @param filePath - Path to capabilities.yaml file
+ * @param knowledgeGraph - Extracted knowledge graph
+ * @param options - Validation options
+ * @returns Validation result
+ */
+export async function validateCapabilitiesFile(
+  filePath: string,
+  knowledgeGraph: KnowledgeGraph,
+  options: ValidateOptions = {}
+): Promise<ValidationResult> {
+  const capabilities = await loadCapabilitiesFile(filePath);
+  return validateCompleteness(knowledgeGraph, capabilities, options);
+}
+
+/**
+ * Create an empty validation result (for cases with no data)
+ */
+export function createEmptyValidationResult(): ValidationResult {
+  return {
+    score: 100,
+    missing: [],
+    stale: [],
+    warnings: [],
+    suggestions: ['No entities to validate'],
+    validatedAt: new Date(),
+  };
+}
+
+/**
+ * Check if a validation result indicates issues
+ */
+export function hasValidationIssues(result: ValidationResult): boolean {
+  return result.missing.length > 0 || result.stale.length > 0;
+}
+
+/**
+ * Format validation result as a human-readable string
+ */
+export function formatValidationResult(result: ValidationResult): string {
+  const lines: string[] = [];
+
+  lines.push(`Completeness Score: ${result.score}%`);
+  lines.push('');
+
+  if (result.missing.length > 0) {
+    lines.push(`Missing from documentation (${result.missing.length}):`);
+    for (const entity of result.missing.slice(0, 10)) {
+      lines.push(`  - ${entity}`);
+    }
+    if (result.missing.length > 10) {
+      lines.push(`  ... and ${result.missing.length - 10} more`);
+    }
+    lines.push('');
+  }
+
+  if (result.stale.length > 0) {
+    lines.push(`Stale documentation (${result.stale.length}):`);
+    for (const entry of result.stale.slice(0, 10)) {
+      lines.push(`  - ${entry}`);
+    }
+    if (result.stale.length > 10) {
+      lines.push(`  ... and ${result.stale.length - 10} more`);
+    }
+    lines.push('');
+  }
+
+  if (result.warnings.length > 0) {
+    lines.push(`Warnings (${result.warnings.length}):`);
+    for (const warning of result.warnings.slice(0, 5)) {
+      lines.push(`  [${warning.type}] ${warning.entity}: ${warning.message}`);
+    }
+    if (result.warnings.length > 5) {
+      lines.push(`  ... and ${result.warnings.length - 5} more`);
+    }
+    lines.push('');
+  }
+
+  lines.push('Suggestions:');
+  for (const suggestion of result.suggestions) {
+    lines.push(`  - ${suggestion}`);
+  }
+
+  return lines.join('\n');
+}

packages/cognitive-context/src/watcher.test.ts

@@ -0,0 +1,286 @@
+/**
+ * Watcher Module Tests
+ *
+ * Tests for the file watcher functionality.
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import type { FileEvent, WatchConfig, WatcherCallbacks } from './types.js';
+import {
+  createWatcher,
+  createDefaultWatchConfig,
+  mergeIgnorePaths,
+} from './watcher.js';
+
+// ============================================
+// Mock chokidar
+// ============================================
+
+// Create mock event emitter functionality
+type EventHandler = (path: string) => void;
+type ErrorHandler = (error: Error) => void;
+
+interface MockWatcher {
+  on: ReturnType<typeof vi.fn>;
+  close: ReturnType<typeof vi.fn>;
+  _handlers: {
+    add: EventHandler[];
+    change: EventHandler[];
+    unlink: EventHandler[];
+    error: ErrorHandler[];
+  };
+  _emit: (event: string, data: string | Error) => void;
+}
+
+let mockWatcherInstance: MockWatcher;
+
+vi.mock('chokidar', () => ({
+  default: {
+    watch: vi.fn(() => {
+      mockWatcherInstance = {
+        _handlers: {
+          add: [],
+          change: [],
+          unlink: [],
+          error: [],
+        },
+        on: vi.fn(function (this: MockWatcher, event: string, handler: EventHandler | ErrorHandler) {
+          if (event in this._handlers) {
+            (this._handlers as Record<string, (EventHandler | ErrorHandler)[]>)[event].push(handler);
+          }
+          return this;
+        }),
+        close: vi.fn(() => Promise.resolve()),
+        _emit: function (event: string, data: string | Error) {
+          const handlers = (this._handlers as Record<string, (EventHandler | ErrorHandler)[]>)[event];
+          if (handlers) {
+            handlers.forEach((h) => {
+              if (event === 'error') {
+                (h as ErrorHandler)(data as Error);
+              } else {
+                (h as EventHandler)(data as string);
+              }
+            });
+          }
+        },
+      };
+      return mockWatcherInstance;
+    }),
+  },
+}));
+
+// ============================================
+// Test Utilities
+// ============================================
+
+function createMockCallbacks(): WatcherCallbacks & {
+  events: FileEvent[];
+  errors: Error[];
+} {
+  const events: FileEvent[] = [];
+  const errors: Error[] = [];
+
+  return {
+    events,
+    errors,
+    onFileChange: vi.fn((event: FileEvent) => {
+      events.push(event);
+    }),
+    onError: vi.fn((error: Error) => {
+      errors.push(error);
+    }),
+  };
+}
+
+function createTestConfig(overrides: Partial<WatchConfig> = {}): WatchConfig {
+  return {
+    enabled: true,
+    debounceMs: 50, // Use short debounce for tests
+    ignorePaths: [],
+    ...overrides,
+  };
+}
+
+// ============================================
+// Tests
+// ============================================
+
+describe('createWatcher', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    vi.clearAllMocks();
+  });
+
+  it('should create a watcher that starts and stops correctly', () => {
+    const callbacks = createMockCallbacks();
+    const config = createTestConfig();
+    const watcher = createWatcher(['./src'], config, callbacks);
+
+    expect(watcher.isRunning()).toBe(false);
+
+    watcher.start();
+    expect(watcher.isRunning()).toBe(true);
+
+    watcher.stop();
+    expect(watcher.isRunning()).toBe(false);
+    expect(mockWatcherInstance.close).toHaveBeenCalled();
+  });
+
+  it('should debounce file change events', async () => {
+    const callbacks = createMockCallbacks();
+    const config = createTestConfig({ debounceMs: 100 });
+    const watcher = createWatcher(['./src'], config, callbacks);
+
+    watcher.start();
+
+    // Emit multiple events in quick succession
+    mockWatcherInstance._emit('change', '/src/file1.ts');
+    mockWatcherInstance._emit('change', '/src/file2.ts');
+    mockWatcherInstance._emit('change', '/src/file1.ts'); // Same file again
+
+    // Events should not be processed yet
+    expect(callbacks.events).toHaveLength(0);
+
+    // Advance time past debounce threshold
+    vi.advanceTimersByTime(150);
+
+    // Now events should be processed (file1 should only appear once due to deduplication)
+    expect(callbacks.events).toHaveLength(2);
+    expect(callbacks.events.map((e) => e.path)).toContain('/src/file1.ts');
+    expect(callbacks.events.map((e) => e.path)).toContain('/src/file2.ts');
+
+    watcher.stop();
+  });
+
+  it('should emit correct event types for add, change, and unlink', async () => {
+    const callbacks = createMockCallbacks();
+    const config = createTestConfig({ debounceMs: 50 });
+    const watcher = createWatcher(['./src'], config, callbacks);
+
+    watcher.start();
+
+    mockWatcherInstance._emit('add', '/src/new-file.ts');
+    vi.advanceTimersByTime(100);
+
+    mockWatcherInstance._emit('change', '/src/existing-file.ts');
+    vi.advanceTimersByTime(100);
+
+    mockWatcherInstance._emit('unlink', '/src/deleted-file.ts');
+    vi.advanceTimersByTime(100);
+
+    expect(callbacks.events).toHaveLength(3);
+    expect(callbacks.events[0]).toMatchObject({
+      type: 'add',
+      path: '/src/new-file.ts',
+    });
+    expect(callbacks.events[1]).toMatchObject({
+      type: 'change',
+      path: '/src/existing-file.ts',
+    });
+    expect(callbacks.events[2]).toMatchObject({
+      type: 'unlink',
+      path: '/src/deleted-file.ts',
+    });
+
+    watcher.stop();
+  });
+
+  it('should call onError callback when chokidar emits an error', () => {
+    const callbacks = createMockCallbacks();
+    const config = createTestConfig();
+    const watcher = createWatcher(['./src'], config, callbacks);
+
+    watcher.start();
+
+    const testError = new Error('Permission denied');
+    mockWatcherInstance._emit('error', testError);
+
+    expect(callbacks.errors).toHaveLength(1);
+    expect(callbacks.errors[0].message).toBe('Permission denied');
+
+    watcher.stop();
+  });
+
+  it('should not start again if already running', () => {
+    const callbacks = createMockCallbacks();
+    const config = createTestConfig();
+    const watcher = createWatcher(['./src'], config, callbacks);
+
+    watcher.start();
+    watcher.start(); // Should be a no-op
+
+    expect(watcher.isRunning()).toBe(true);
+
+    watcher.stop();
+  });
+
+  it('should flush pending events when stopped', () => {
+    const callbacks = createMockCallbacks();
+    const config = createTestConfig({ debounceMs: 1000 });
+    const watcher = createWatcher(['./src'], config, callbacks);
+
+    watcher.start();
+
+    mockWatcherInstance._emit('change', '/src/file.ts');
+
+    // Events not flushed yet due to long debounce
+    expect(callbacks.events).toHaveLength(0);
+
+    // Stop should flush immediately
+    watcher.stop();
+
+    expect(callbacks.events).toHaveLength(1);
+    expect(callbacks.events[0].path).toBe('/src/file.ts');
+  });
+});
+
+describe('createDefaultWatchConfig', () => {
+  it('should create config with default values', () => {
+    const config = createDefaultWatchConfig();
+
+    expect(config.enabled).toBe(true);
+    expect(config.debounceMs).toBe(500);
+    expect(config.ignorePaths).toContain('node_modules');
+    expect(config.ignorePaths).toContain('.git');
+  });
+
+  it('should allow overriding default values', () => {
+    const config = createDefaultWatchConfig({
+      enabled: false,
+      debounceMs: 1000,
+    });
+
+    expect(config.enabled).toBe(false);
+    expect(config.debounceMs).toBe(1000);
+  });
+});
+
+describe('mergeIgnorePaths', () => {
+  it('should merge user paths with defaults', () => {
+    const merged = mergeIgnorePaths(['.cache', 'tmp']);
+
+    expect(merged).toContain('node_modules');
+    expect(merged).toContain('.git');
+    expect(merged).toContain('.cache');
+    expect(merged).toContain('tmp');
+  });
+
+  it('should deduplicate paths', () => {
+    const merged = mergeIgnorePaths(['node_modules', 'custom']);
+
+    const nodeModulesCount = merged.filter((p) => p === 'node_modules').length;
+    expect(nodeModulesCount).toBe(1);
+  });
+
+  it('should work with empty array', () => {
+    const merged = mergeIgnorePaths([]);
+
+    expect(merged).toContain('node_modules');
+    expect(merged).toContain('.git');
+    expect(merged.length).toBeGreaterThan(0);
+  });
+});

packages/cognitive-context/src/watcher.ts

@@ -0,0 +1,238 @@
+/**
+ * File Watcher Module
+ *
+ * Watches source directories for file changes and emits debounced events.
+ * Uses chokidar for cross-platform file system watching.
+ */
+
+import chokidar from 'chokidar';
+import type { FSWatcher } from 'chokidar';
+import type { FileEventType, WatchConfig, WatcherCallbacks } from './types.js';
+
+// ============================================
+// Constants
+// ============================================
+
+const DEFAULT_DEBOUNCE_MS = 500;
+const DEFAULT_IGNORE_PATHS = [
+  'node_modules',
+  '.git',
+  'dist',
+  'build',
+  '.next',
+  'coverage',
+];
+
+// ============================================
+// Watcher Interface
+// ============================================
+
+export interface Watcher {
+  /** Start watching the configured directories */
+  start(): void;
+  /** Stop watching and clean up resources */
+  stop(): void;
+  /** Check if the watcher is currently running */
+  isRunning(): boolean;
+}
+
+// ============================================
+// Internal Types
+// ============================================
+
+interface PendingEvent {
+  type: FileEventType;
+  path: string;
+  timestamp: Date;
+}
+
+// ============================================
+// Factory Function
+// ============================================
+
+/**
+ * Creates a file watcher that monitors source directories for changes.
+ *
+ * @param sourceDirs - Array of directories to watch
+ * @param config - Watch configuration options
+ * @param callbacks - Event callbacks
+ * @returns A Watcher instance
+ *
+ * @example
+ * ```ts
+ * const watcher = createWatcher(
+ *   ['./src', './lib'],
+ *   { enabled: true, debounceMs: 300, ignorePaths: [] },
+ *   {
+ *     onFileChange: (event) => console.log('File changed:', event.path),
+ *     onError: (error) => console.error('Watch error:', error),
+ *   }
+ * );
+ *
+ * watcher.start();
+ * // ... later
+ * watcher.stop();
+ * ```
+ */
+export function createWatcher(
+  sourceDirs: string[],
+  config: WatchConfig,
+  callbacks: WatcherCallbacks
+): Watcher {
+  let fsWatcher: FSWatcher | null = null;
+  let running = false;
+  let pendingEvents: Map<string, PendingEvent> = new Map();
+  let debounceTimer: ReturnType<typeof setTimeout> | null = null;
+
+  const debounceMs = config.debounceMs ?? DEFAULT_DEBOUNCE_MS;
+  const ignorePaths = [
+    ...DEFAULT_IGNORE_PATHS,
+    ...(config.ignorePaths ?? []),
+  ];
+
+  /**
+   * Flushes all pending events, calling the onFileChange callback for each
+   */
+  function flushEvents(): void {
+    if (pendingEvents.size === 0) return;
+
+    const events = Array.from(pendingEvents.values());
+    pendingEvents.clear();
+
+    for (const event of events) {
+      try {
+        callbacks.onFileChange?.(event);
+      } catch (error) {
+        callbacks.onError?.(
+          error instanceof Error ? error : new Error(String(error))
+        );
+      }
+    }
+  }
+
+  /**
+   * Schedules a debounced flush of events
+   */
+  function scheduleFlush(): void {
+    if (debounceTimer) {
+      clearTimeout(debounceTimer);
+    }
+    debounceTimer = setTimeout(() => {
+      debounceTimer = null;
+      flushEvents();
+    }, debounceMs);
+  }
+
+  /**
+   * Handles a raw file system event from chokidar
+   */
+  function handleEvent(type: FileEventType, path: string): void {
+    const event: PendingEvent = {
+      type,
+      path,
+      timestamp: new Date(),
+    };
+
+    // Use path as key - later events for same path override earlier ones
+    pendingEvents.set(path, event);
+    scheduleFlush();
+  }
+
+  /**
+   * Handles errors from chokidar
+   */
+  function handleError(error: Error): void {
+    callbacks.onError?.(error);
+  }
+
+  return {
+    start(): void {
+      if (running) {
+        return;
+      }
+
+      try {
+        // Build ignore patterns from configured paths
+        const ignorePatterns = ignorePaths.map((p) => `**/${p}/**`);
+
+        fsWatcher = chokidar.watch(sourceDirs, {
+          ignored: ignorePatterns,
+          persistent: true,
+          ignoreInitial: true,
+          awaitWriteFinish: {
+            stabilityThreshold: 100,
+            pollInterval: 50,
+          },
+        });
+
+        fsWatcher
+          .on('add', (path) => handleEvent('add', path))
+          .on('change', (path) => handleEvent('change', path))
+          .on('unlink', (path) => handleEvent('unlink', path))
+          .on('error', handleError);
+
+        running = true;
+      } catch (error) {
+        callbacks.onError?.(
+          error instanceof Error ? error : new Error(String(error))
+        );
+      }
+    },
+
+    stop(): void {
+      if (!running) {
+        return;
+      }
+
+      // Clear any pending debounce timer
+      if (debounceTimer) {
+        clearTimeout(debounceTimer);
+        debounceTimer = null;
+      }
+
+      // Flush any remaining events immediately
+      flushEvents();
+
+      // Close the watcher
+      if (fsWatcher) {
+        fsWatcher.close().catch((error) => {
+          callbacks.onError?.(
+            error instanceof Error ? error : new Error(String(error))
+          );
+        });
+        fsWatcher = null;
+      }
+
+      running = false;
+    },
+
+    isRunning(): boolean {
+      return running;
+    },
+  };
+}
+
+// ============================================
+// Utility Functions
+// ============================================
+
+/**
+ * Creates a WatchConfig with sensible defaults
+ */
+export function createDefaultWatchConfig(
+  overrides: Partial<WatchConfig> = {}
+): WatchConfig {
+  return {
+    enabled: overrides.enabled ?? true,
+    debounceMs: overrides.debounceMs ?? DEFAULT_DEBOUNCE_MS,
+    ignorePaths: overrides.ignorePaths ?? [...DEFAULT_IGNORE_PATHS],
+  };
+}
+
+/**
+ * Merges user-provided ignore paths with defaults
+ */
+export function mergeIgnorePaths(userPaths: string[] = []): string[] {
+  const combined = new Set([...DEFAULT_IGNORE_PATHS, ...userPaths]);
+  return Array.from(combined);
+}

packages/cognitive-context/tsconfig.json

@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "lib": ["ES2022"],
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts"]
+}