start() mints/stores a fresh token, then either binds the loopback HTTP
listener (bind_loopback + http_transport::serve) or, for stdio, just
records "enabled" and hands back the whishassist.exe --mcp-stdio command
line the agent's client config should spawn -- there is nothing to run
in-process for stdio (see mcp::stdio_transport). stop() tears down the
HTTP listener if any and deletes the stored token. instance() is a
process-wide singleton (OnceLock) so separate Tauri command invocations
(set_mcp_enabled/mcp_status/set_mcp_scope) share the same running state.
iamdoubz
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