feat(broker): scaffold apps/broker workspace (bun WS runtime, no port yet)

- @claudemesh/broker package with bun dev/start scripts
- src/index.ts stub: WS server on BROKER_PORT, SIGTERM cleanup
- src/env.ts: Zod-validated env (BROKER_PORT, DATABASE_URL, STATUS_TTL_SECONDS, HOOK_FRESH_WINDOW_SECONDS)
- src/db.ts: re-exports Drizzle client from @turbostarter/db
- src/broker.ts + src/types.ts: placeholders for step 8 port
- README documents run commands, env vars, deploy targets
- tsconfig extends @turbostarter/tsconfig base
- eslint.config.js extends @turbostarter/eslint-config/base

Dependencies declared but not installed yet (ws, drizzle-orm, zod,
libsodium-wrappers + workspace deps). turbo.json unchanged: the global
dev task already has persistent=true + cache=false which is what the
broker needs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/broker/tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "extends": "@turbostarter/tsconfig/base.json",
+  "compilerOptions": {
+    "lib": ["es2022"],
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "baseUrl": ".",
+    "paths": {
+      "~/*": ["./src/*"]
+    },
+    "types": ["bun-types"]
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["node_modules", "dist"]
+}