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/tsconfig.json

@@ -1,13 +1,28 @@
 {
-  "extends": "../../tsconfig.json",
+  "$schema": "https://json.schemastore.org/tsconfig",
   "compilerOptions": {
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "target": "ES2021",
+    "sourceMap": true,
     "outDir": "./dist",
-    "rootDir": "./src",
-    "strict": true,
-    "esModuleInterop": true,
+    "baseUrl": "./",
+    "incremental": true,
     "skipLibCheck": true,
+    "strictNullChecks": true,
+    "noImplicitAny": true,
+    "strictBindCallApply": true,
     "forceConsistentCasingInFileNames": true,
-    "resolveJsonModule": true
+    "noFallthroughCasesInSwitch": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "strict": true,
+    "lib": ["ES2021"]
   },
   "include": ["src/**/*"],
   "exclude": ["node_modules", "dist", "tests"]