bb5beb79da
Track per-rig server connection state in `rig_server_connected` so that when one trx-server drops, only the rig(s) it serves are marked disconnected. Other rigs with active connections remain fully interactive. The SSE `server_connected` field is now resolved from the per-rig map for the session's active rig, falling back to the global flag for backward compatibility. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Signed-off-by: Stan Grams <sjg@haxx.space>