Adds two new bundled hooks:
1. session-backup: Automated hourly session backups with activity-based lifecycle
- Tracks user activity via lastUserMessage timestamp
- Creates hourly backups while user is active
- Grace period (1-2h) triggers final backup then stops
- Respects backupActive flag to avoid unnecessary work
2. context-aggregator: Aggregates memory into CONTEXT.md
- Collects from hourly backups, daily notes, session summaries
- Updates activity state from session logs
- Provides memory management reminders
- Creates unified context for session continuity
Also adds tests for session-backup hook covering:
- State management
- Activity detection
- Backup creation
- Full lifecycle simulation
Resolves the 'new intern each session' problem by providing structured
memory persistence that doesn't rely on agent behavioral compliance.
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