feat(M6): Set up orchestrator service foundation

Add NestJS-based orchestrator service structure for M6-AgentOrchestration.

Changes:
- Migrate from Express to NestJS architecture
- Add health check endpoint module
- Add placeholder modules: coordinator, git, killswitch, monitor, queue, spawner, valkey
- Update configuration for NestJS
- Update lockfile for new dependencies

This is foundational work for M6-AgentOrchestration milestone.

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

apps/orchestrator/package.json

@@ -2,32 +2,47 @@
   "name": "@mosaic/orchestrator",
   "version": "0.0.6",
   "private": true,
-  "type": "module",
-  "main": "dist/main.js",
   "scripts": {
-    "dev": "tsx watch src/main.ts",
-    "build": "tsc",
+    "dev": "nest start --watch",
+    "build": "nest build",
+    "start": "node dist/main.js",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main.js",
     "test": "vitest",
     "test:watch": "vitest watch",
+    "test:e2e": "vitest run --config tests/integration/vitest.config.ts",
     "typecheck": "tsc --noEmit",
     "lint": "eslint src/",
     "lint:fix": "eslint src/ --fix"
   },
   "dependencies": {
-    "@anthropic-ai/sdk": "^0.31.1",
+    "@anthropic-ai/sdk": "^0.72.1",
     "@mosaic/shared": "workspace:*",
     "@mosaic/config": "workspace:*",
-    "fastify": "^5.2.0",
-    "ioredis": "^5.4.2",
+    "@nestjs/common": "^11.1.12",
+    "@nestjs/core": "^11.1.12",
+    "@nestjs/platform-express": "^11.1.12",
+    "@nestjs/config": "^4.0.2",
+    "@nestjs/bullmq": "^11.0.4",
+    "bullmq": "^5.67.2",
+    "ioredis": "^5.9.2",
     "dockerode": "^4.0.2",
     "simple-git": "^3.27.0",
-    "zod": "^3.24.1"
+    "zod": "^3.24.1",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1"
   },
   "devDependencies": {
+    "@nestjs/cli": "^11.0.6",
+    "@nestjs/schematics": "^11.0.1",
+    "@nestjs/testing": "^11.1.12",
     "@types/dockerode": "^3.3.31",
-    "@types/node": "^22.10.5",
-    "tsx": "^4.19.2",
+    "@types/node": "^22.13.4",
+    "@types/express": "^5.0.1",
     "typescript": "^5.8.2",
-    "vitest": "^3.0.8"
+    "vitest": "^4.0.18",
+    "ts-node": "^10.9.2",
+    "tsconfig-paths": "^4.2.0"
   }
 }