3a477f673c
Implements per-agent backoff tracking to reduce noise for busy agents: - AgentBackoff type tracks interval, miss count, and last activity - BackoffManager manages state across all agents - Geometric backoff strategy (1.5x factor, 10min cap) - Integrates with keepalive to skip pokes when agents are fresh - Resets backoff immediately when activity detected Closes gt-8bx 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>