The health-scan step now includes gt nudge commands that serve dual purposes:
1. Liveness verification - agent responds to prove it's alive
2. Backoff reset - any nudge resets agent's backoff to base interval
This ensures patrol agents (witness/refinery) remain responsive even during
quiet periods when the feed has no mutations. Since Deacon patrols every
~1-2 minutes, maximum backoff is bounded by the ping interval.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>