New doc covering:
- Events as state transitions (type: event beads)
- Labels-as-state pattern for fast queries
- Boot: daemon entry point dog for Deacon triage
- Degraded mode (no-tmux operation)
Related issues:
- gt-rwd5j: Implement Boot
- bd-ecmd: Add type: event
- bd-irah: Add refs field
- bd-31ae: Document labels-as-state
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
