Builds its own tokio runtime (there is no Tauri app in this mode) and
tracing goes to stderr, not stdout -- stdout is the MCP JSON-RPC channel.
Connects to the same wa.db as the GUI instance via SqliteStore::connect,
builds a WaMcpHandler with no AppHandle (None), and runs it to
completion via mcp::stdio_transport::serve_once. A build without the
`mcp` feature prints an error and exits(1) instead of silently opening
the GUI.
iamdoubz
f99845ef1b