feat(cli): 1.5.0 — CLI-first architecture, tool-less MCP, policy engine

CLI becomes the API; MCP becomes a tool-less push-pipe. Bundle -42%
(250 KB → 146 KB) after stripping ~1700 lines of dead tool handlers.

- Tool-less MCP: tools/list returns []. Inbound peer messages still
  arrive as experimental.claude/channel notifications mid-turn.
- Resource-noun-verb CLI: peer list, message send, memory recall, etc.
  Legacy flat verbs (peers, send, remember) remain as aliases.
- Bundled claudemesh skill auto-installed by `claudemesh install` —
  sole CLI-discoverability surface for Claude.
- Unix-socket bridge: CLI invocations dial the push-pipe's warm WS
  (~220 ms warm vs ~600 ms cold).
- --mesh <slug> flag: connect a session to multiple meshes.
- Policy engine: every broker-touching verb runs through a YAML gate
  at ~/.claudemesh/policy.yaml (auto-created). Destructive verbs
  prompt; non-TTY auto-denies. Audit log at ~/.claudemesh/audit.log.
- --approval-mode plan|read-only|write|yolo + --policy <path>.

Spec: .artifacts/specs/2026-05-02-architecture-north-star.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/cli/src/commands/leave.ts

@@ -6,20 +6,24 @@
  */
 
 import { readConfig, writeConfig } from "~/services/config/facade.js";
+import { render } from "~/ui/render.js";
+import { bold, dim } from "~/ui/styles.js";
+import { EXIT } from "~/constants/exit-codes.js";
 
-export function runLeave(args: string[]): void {
+export function runLeave(args: string[]): number {
   const slug = args[0];
   if (!slug) {
-    console.error("Usage: claudemesh leave <slug>");
-    process.exit(1);
+    render.err("Usage: claudemesh leave <slug>");
+    return EXIT.INVALID_ARGS;
   }
   const config = readConfig();
   const before = config.meshes.length;
   config.meshes = config.meshes.filter((m) => m.slug !== slug);
   if (config.meshes.length === before) {
-    console.error(`claudemesh: no joined mesh with slug "${slug}"`);
-    process.exit(1);
+    render.err(`no joined mesh with slug "${slug}"`);
+    return EXIT.NOT_FOUND;
   }
   writeConfig(config);
-  console.log(`Left mesh "${slug}". Remaining: ${config.meshes.length}`);
+  render.ok(`left ${bold(slug)}`, dim(`remaining: ${config.meshes.length}`));
+  return EXIT.SUCCESS;
 }