- Introduced a new Rqlite MCP server implementation in `cmd/rqlite-mcp`, enabling JSON-RPC communication for database operations.
- Updated the Makefile to include the build command for the Rqlite MCP server.
- Enhanced the WebSocket PubSub client with presence capabilities, allowing members to join and leave topics with notifications.
- Implemented presence management in the gateway, including endpoints for querying current members in a topic.
- Added end-to-end tests for presence functionality, ensuring correct behavior during member join and leave events.
