feat(TRUEREF-0011-0012): implement MCP server with stdio and HTTP transports

- resolve-library-id and query-docs tools with context7-identical schemas
- stdio transport for Claude Code, Cursor, and other MCP clients
- HTTP transport via StreamableHTTPServerTransport on configurable port
- /mcp endpoint with CORS and /ping health check
- mcp:start and mcp:http npm scripts
- Claude Code rule file at .claude/rules/trueref.md

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

package.json

@@ -15,6 +15,7 @@
 		"test:unit": "vitest",
 		"test": "npm run test:unit -- --run",
 		"mcp:start": "tsx src/mcp/index.ts",
+		"mcp:http": "tsx src/mcp/index.ts --transport http --port 3001",
 		"db:push": "drizzle-kit push",
 		"db:generate": "drizzle-kit generate",
 		"db:migrate": "drizzle-kit migrate",