Implement fleet-level sentinel link coordination with zone-aware idle modes:
- Zone membership tracking: Track which nodes belong to which zones and update zone state on motion events
- Zone idle detection: Detect when all nodes in a zone have been idle and designate one sentinel link per zone at 5 Hz
- Sentinel designation: Lexicographically smallest MAC becomes sentinel (5 Hz), others drop to 1 Hz
- Fleet idle coordination: When all zones are idle, only sentinel links run at 5 Hz for minimal bandwidth
- Adjacent zone ramping: When motion detected in a zone, ramp adjacent zones to 5 Hz for preemptive coverage
- RampZone() method: Interface for prediction engine to preemptively ramp zones when P(arrival) > threshold
- Zone-aware tests: Comprehensive tests for zone membership, idle detection, sentinel designation, fleet coordination, and backward compatibility
Co-Authored-By: Claude <noreply@anthropic.com>
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