Implements convenience commands for the labels-as-state pattern:
- `bd state <id> <dimension>` - Query current state value from labels
- `bd state list <id>` - List all state dimensions on an issue
- `bd set-state <id> <dimension>=<value> --reason "..."` - Atomically:
1. Create event bead (source of truth)
2. Remove old dimension label
3. Add new dimension:value label (cache)
Common dimensions: patrol, mode, health, status
Convention: <dimension>:<value> (e.g., patrol:active, mode:degraded)
Updated docs/CLI_REFERENCE.md with new State section.
Updated docs/LABELS.md to reflect implemented helpers.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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