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>
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