feat: Add MCP server stubs, development docs, and Docker updates

- Add MCP server skeleton implementations for all 7 planned servers
  (llm-gateway, knowledge-base, git, issues, filesystem, code-analysis, cicd)
- Add comprehensive DEVELOPMENT.md with setup and usage instructions
- Add BACKLOG.md with detailed phase planning
- Update docker-compose.dev.yml with Redis and Celery workers
- Update CLAUDE.md with Syndarix-specific context

Addresses issues #16, #20, #21

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docker-compose.dev.yml

@@ -1,6 +1,6 @@
 services:
   db:
-    image: postgres:17-alpine
+    image: pgvector/pgvector:pg17
     volumes:
       - postgres_data_dev:/var/lib/postgresql/data/
     environment:
@@ -17,6 +17,21 @@ services:
     networks:
       - app-network
 
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_data_dev:/data
+    command: redis-server --appendonly yes
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    networks:
+      - app-network
+
   backend:
     build:
       context: ./backend
@@ -37,13 +52,108 @@ services:
       - ENVIRONMENT=development
       - DEBUG=true
       - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
+      - REDIS_URL=redis://redis:6379/0
     depends_on:
       db:
         condition: service_healthy
+      redis:
+        condition: service_healthy
     networks:
       - app-network
     command: ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--reload"]
 
+  # Celery workers for background task processing (per ADR-003)
+  celery-agent:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+      target: development
+    volumes:
+      - ./backend:/app
+      - /app/.venv
+    env_file:
+      - .env
+    environment:
+      - DATABASE_URL=${DATABASE_URL}
+      - REDIS_URL=redis://redis:6379/0
+      - CELERY_QUEUE=agent
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - app-network
+    command: ["celery", "-A", "app.celery_app", "worker", "-Q", "agent", "-l", "info", "-c", "4"]
+
+  celery-git:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+      target: development
+    volumes:
+      - ./backend:/app
+      - /app/.venv
+    env_file:
+      - .env
+    environment:
+      - DATABASE_URL=${DATABASE_URL}
+      - REDIS_URL=redis://redis:6379/0
+      - CELERY_QUEUE=git
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - app-network
+    command: ["celery", "-A", "app.celery_app", "worker", "-Q", "git", "-l", "info", "-c", "2"]
+
+  celery-sync:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+      target: development
+    volumes:
+      - ./backend:/app
+      - /app/.venv
+    env_file:
+      - .env
+    environment:
+      - DATABASE_URL=${DATABASE_URL}
+      - REDIS_URL=redis://redis:6379/0
+      - CELERY_QUEUE=sync
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - app-network
+    command: ["celery", "-A", "app.celery_app", "worker", "-Q", "sync", "-l", "info", "-c", "2"]
+
+  celery-beat:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+      target: development
+    volumes:
+      - ./backend:/app
+      - /app/.venv
+    env_file:
+      - .env
+    environment:
+      - DATABASE_URL=${DATABASE_URL}
+      - REDIS_URL=redis://redis:6379/0
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - app-network
+    command: ["celery", "-A", "app.celery_app", "beat", "-l", "info"]
+
   frontend:
     build:
       context: ./frontend
@@ -68,6 +178,7 @@ services:
 
 volumes:
   postgres_data_dev:
+  redis_data_dev:
   frontend_dev_modules:
   frontend_dev_next: