The monitor was a blocking listen window that monopolized the app. Convert
it to an always-on background subscription that logs overheard adverts/
telemetry while the user keeps using the menu.
- Device: add subscribe_observations() as the non-blocking capture primitive;
listen() is now a thin foreground wrapper over it. Mock streams a live
packet burst + cadence instead of a bounded synth loop.
- MonitorService (ctx.monitor): owns the subscription, session/total counters,
and the on/off preference; logs each packet as it arrives.
- MonitorStore: persist on/off in <config_dir>/monitor.json, default off,
remembered between sessions and auto-resumed at launch.
- Menu: the monitor entry is now a toggle/heard-nodes control panel; the
header shows live session/total counts and repaints ~1s via refresh_interval.
- CLI monitor gains --on/--off (preference) and keeps --seconds for a scripted
foreground capture.
- Add Repository.observation_count(); README + tests (129 pass).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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