Adds comprehensive documentation for using labels as a state cache:
- Convention: <dimension>:<value> (e.g., patrol:muted)
- Pattern: Create event bead (history) + update labels (cache)
- Common dimensions table (patrol, mode, status, health, lock)
- State transition examples with audit trail
- Querying and best practices
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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