Add comprehensive crash logging improvements to help diagnose mass session death events:
- Add TypeSessionDeath and TypeMassDeath event types for feed visibility
- Log pre-death events before killing sessions (who killed, why)
- Add mass death detection in daemon (3+ deaths in 30s triggers alert)
- Add macOS crash report check in gt doctor
- Support session death events in townlog and feed curator
Closes hq-kt1o6
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Implements the feed daemon goroutine that:
- Tails ~/gt/.events.jsonl for raw events
- Filters by visibility tag (keeps feed/both, drops audit)
- Deduplicates repeated done events from same actor
- Aggregates sling events when multiple occur in window
- Writes curated events to ~/gt/.feed.jsonl with summaries
The curator runs as a goroutine in the gt daemon, starting when
the daemon starts and stopping gracefully on shutdown.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>