[trissim]

Confirming that a selected route is still live was implemented three times, and member reconnect silently returned when it saw a stale route. CoordinationAccess.confirm now owns that comparison and its RouteChangedError.

• require calls confirm before service lookup.
• open_selected keeps its separate service-root check, then calls confirm while hold_client_route is held.
• NativeSessionEntry.reconnect calls the owner's confirm first. Its separate replaced-entry check remains; a stale route now raises rather than returning silently.

Existing visible error path, read before editing:

1. session_entry.py:157 raises from confirm; session_navigation.py:187 awaits member.reconnect.
2. thread_actions.py:104 awaits SessionNavigation.reconnect from ThreadAction.completed.
3. thread_actions.py:77 awaits completed inside ThreadActionExecution.run. Its finally at :78-80 clears the pending action without swallowing the error.
4. thread_actions.py:64 creates the Textual worker via app.run_worker. Installed Textual dom.py:786 defaults exit_on_error=True; worker.py:431 forwards WorkerFailed to app._handle_exception, preserving the original cause.
5. ToadApp._handle_exception at app.py:281-286 calls show_error for a mounted screen; textual_colours.py:474-477 emits the visible error notification. No catch was added.

Step 5 at a825ba7:

src/toad/comms_root.py:365:        if RouteSelection.capture() != selected:

That line is inside confirm. Both changed Python files parse. No tests run, as directed.

Assumed: these interactive thread actions run with a mounted screen, as required by the existing visible-error handler. The installed Textual worker path was read from core-a02979325.

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