v2.0.2: BooCoder MCP server — 6 tools over stdio

Phase 6 of v2.0. BooCoder exposes its task primitives as MCP tools
so external agents (Sam's opencode in Termius) can drive the task
queue without going through the web UI.

6 MCP tools registered via McpServer + StdioServerTransport:
- boocoder.create_task — INSERT pending task
- boocoder.list_pending_changes — SELECT pending changes
- boocoder.apply — apply a specific pending change to disk
- boocoder.reject — reject a pending change
- boocoder.dispatch_external_agent — create task with agent for Path B
- boocoder.list_worktrees — list active worktrees from running tasks

Activated by --mcp CLI flag: `node dist/index.js --mcp` starts the
MCP server over stdio instead of the HTTP server. Configure in
opencode: {"mcpServers":{"boocoder":{"type":"stdio","command":"docker",
"args":["exec","-i","boocoder","node","dist/index.js","--mcp"]}}}

Uses McpServer class from @modelcontextprotocol/sdk/server/mcp.js
(high-level .tool() registration API). Zod schemas for input
validation. Process blocks on stdin close, cleanly shuts down DB.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/coder/package.json

@@ -16,6 +16,7 @@
     "@boocode/server": "workspace:*",
     "@fastify/static": "^7.0.4",
     "@fastify/websocket": "^10.0.1",
+    "@modelcontextprotocol/sdk": "^1.29.0",
     "fastify": "^4.28.1",
     "postgres": "^3.4.4",
     "zod": "^3.23.8"