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>

mcp-servers/README.md

@@ -0,0 +1,70 @@
+# Syndarix MCP Servers
+
+Model Context Protocol (MCP) servers providing tool access for Syndarix agents.
+
+Per [ADR-005](../docs/adrs/ADR-005-mcp-integration.md), all tools require explicit project scoping.
+
+## Server Overview
+
+| Server | Priority | Purpose | Phase |
+|--------|----------|---------|-------|
+| llm-gateway | 1 | LLM routing with failover and cost tracking | Phase 2 |
+| knowledge-base | 2 | RAG with pgvector for semantic search | Phase 2 |
+| git | 3 | Git operations (clone, commit, push, PR) | Phase 2 |
+| issues | 4 | Issue tracker sync (Gitea, GitHub, GitLab) | Phase 2 |
+| filesystem | 5 | Sandboxed file operations | Phase 5 |
+| code-analysis | 6 | AST parsing, linting, type checking | Phase 5 |
+| cicd | 7 | CI/CD pipeline management | Phase 5 |
+
+## Architecture
+
+Each MCP server is a FastMCP application that:
+1. Exposes tools via Model Context Protocol
+2. Requires `project_id` for all operations (explicit scoping)
+3. Uses Redis for pub/sub communication with agents
+4. Logs all operations to PostgreSQL for audit
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                    Agent Runner                              │
+│                         │                                    │
+│           ┌─────────────┼─────────────┐                     │
+│           ▼             ▼             ▼                     │
+│    ┌──────────┐  ┌──────────┐  ┌──────────┐                │
+│    │ LLM GW   │  │   Git    │  │ Issues   │  ... (7 total) │
+│    │   MCP    │  │   MCP    │  │   MCP    │                 │
+│    └──────────┘  └──────────┘  └──────────┘                 │
+└─────────────────────────────────────────────────────────────┘
+```
+
+## Running Locally
+
+Each MCP server runs as a separate Docker container. See `docker-compose.dev.yml` for configuration.
+
+```bash
+# Start all MCP servers (Phase 2+)
+docker-compose -f docker-compose.dev.yml up -d llm-gateway knowledge-base git issues
+
+# View logs
+docker-compose logs -f llm-gateway
+```
+
+## Development
+
+Each server follows the FastMCP pattern:
+
+```python
+from fastmcp import FastMCP
+
+mcp = FastMCP("server-name")
+
+@mcp.tool()
+def my_tool(project_id: str, ...):
+    """Tool with required project scoping."""
+    # Validate project access
+    # Execute operation
+    # Log for audit
+    pass
+```
+
+See individual server READMEs for specific tool documentation.