test(broker): port test suite from claude-intercom to drizzle/postgres

21 integration tests (14 broker behavior + 7 path encoding), all
passing in ~1s against a real Postgres (claudemesh_test database on
the dev container).

Test infrastructure:
- apps/broker/vitest.config.ts extends @turbostarter/vitest-config/base
- tests/helpers.ts: setupTestMesh() creates a fresh mesh + 2 members
  per test with a unique slug, returns cleanup function that cascades
  the delete. cleanupAllTestMeshes() as an afterAll safety net.
- Mesh isolation in broker logic means tests don't interfere even when
  they share a database — no per-test TRUNCATE needed.

Ported behavior tests (broker.test.ts, 14 tests):
- hook flips status + queued "next" messages unblock
- "now"-priority bypasses the working gate
- DND is sacred (hooks cannot unset it)
- hook source stays fresh through jsonl refresh
- source decays to jsonl when hook signal goes stale
- isHookFresh freshness window + source-type rules
- TTL sweep flips stuck "working" → idle
- TTL sweep leaves DND alone
- first-turn race: hook fired pre-connect stashed in pending_status
- applyPendingHookStatus picks newest matching entry
- expired pending entries are ignored on connect
- broadcast targetSpec (*) reaches all members
- pubkey mismatch → message not drained
- mesh isolation: peer in mesh X doesn't drain from mesh Y

Ported encoding tests (encoding.test.ts, 7 tests):
- macOS, Linux, Windows path encoding first-candidate correctness
- Roberto's H:\Claude → H--Claude regression test (2026-04-04)
- Candidate dedup, drive-stripped fallback, leading-dash fallback

How to run: from apps/broker,
  DATABASE_URL="postgresql://.../claudemesh_test" pnpm test

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

apps/broker/package.json

@@ -9,6 +9,8 @@
     "start": "bun src/index.ts",
     "format": "prettier --check . --ignore-path ../../.gitignore",
     "lint": "eslint",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "typecheck": "tsc --noEmit"
   },
   "prettier": "@turbostarter/prettier-config",
@@ -24,10 +26,12 @@
     "@turbostarter/eslint-config": "workspace:*",
     "@turbostarter/prettier-config": "workspace:*",
     "@turbostarter/tsconfig": "workspace:*",
+    "@turbostarter/vitest-config": "workspace:*",
     "@types/libsodium-wrappers": "0.7.14",
     "@types/ws": "8.5.13",
     "eslint": "catalog:",
     "prettier": "catalog:",
-    "typescript": "catalog:"
+    "typescript": "catalog:",
+    "vitest": "catalog:"
   }
 }