Adds TypeEvent issue type for recording operational state changes as
immutable beads. Events capture:
- event_category: namespaced category (e.g., patrol.muted, agent.started)
- event_actor: entity URI who caused the event
- event_target: entity URI or bead ID affected
- event_payload: event-specific JSON data
Changes:
- Add TypeEvent constant and IsValid() support in types.go
- Add event fields to Issue struct with ComputeContentHash support
- Add --event-category/actor/target/payload flags to bd create
- Add event fields to RPC CreateArgs and UpdateArgs
- Add migration 033_event_fields to add columns to issues table
- Update insertIssue and queries to include event fields
- Fix migrations_test.go for new column requirements
This enables:
- bd activity --follow showing events
- bd list --type=event --target=agent:deacon
- Full audit trail for operational state
- HOP-compatible transaction records
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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