Adds comprehensive design for how wisps squash to digests:
- Cadences: patrol wisps squash per-cycle, work wisps on completion
- Templates: structured formats for patrol and work digests, formula-defined
- Retention: 30d active, 1yr archive, weekly/monthly rollups
- Activity feed integration for observability
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
