feat: Phase 1 MVP — complete AgentIdP implementation

Implements all P0 features per OpenSpec change phase-1-mvp-implementation:
- Agent Registry Service (CRUD) — full lifecycle management
- OAuth 2.0 Token Service (Client Credentials flow)
- Credential Management (generate, rotate, revoke)
- Immutable Audit Log Service

Tech: Node.js 18+, TypeScript 5.3+ strict, Express 4.18+, PostgreSQL 14+, Redis 7+
Standards: OpenAPI 3.0 specs, DRY/SOLID, zero `any` types
Quality: 18 unit test suites, 244 tests passing, 97%+ coverage
OpenAPI: 4 complete specs (14 endpoints total)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,54 @@
+version: '3.9'
+
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      - '3000:3000'
+    environment:
+      - DATABASE_URL=postgresql://sentryagent:sentryagent@postgres:5432/sentryagent_idp
+      - REDIS_URL=redis://redis:6379
+      - PORT=3000
+    env_file:
+      - .env
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    volumes:
+      - ./src:/app/src:ro
+
+  postgres:
+    image: postgres:14-alpine
+    environment:
+      POSTGRES_USER: sentryagent
+      POSTGRES_PASSWORD: sentryagent
+      POSTGRES_DB: sentryagent_idp
+    ports:
+      - '5432:5432'
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ['CMD-SHELL', 'pg_isready -U sentryagent -d sentryagent_idp']
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - '6379:6379'
+    volumes:
+      - redis_data:/data
+    healthcheck:
+      test: ['CMD', 'redis-cli', 'ping']
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  postgres_data:
+  redis_data: