_ notification_poller_loop_ re-emits status.update every cycle
when a background process completes while the session is busy.
The same completion event gets re-queued and re-emitted to the
TUI every few ms, flooding the transcript with duplicate lines.
Add _notification_event_dedup_key(evt) that returns a tuple
identity for each notification event. Only emit status.update
on first sight per identity:
- completions: (sid, type) — one-shot per process session
- watch_match: (sid, type, command, pattern, output, ...)
- watch_overflow/disabled: (sid, type, command, message, ...)
The dedup key design was refined from an initial sid:type approach
after @lordbuffcloud identified that distinct watch_match events
(READY vs DONE) for the same process would be incorrectly collapsed.
Tests from @tymrtn cover distinct watch matches, exact replay
dedup, and completion one-shot behavior.
Co-authored-by: tymrtn <ty@tmrtn.com>
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