Agent health from a 60-second heartbeat: derived, never stored

A coding agent that crashes can't report that it crashed. In my ticket tracker, the orchestrator sends a heartbeat every 60 seconds while an agent works, and a "working" status whose last beat is more than 75 seconds old shows as red on every screen, with no write from anyone. I'm Panth, and I lead the software team at Oizom. The tracker is ticket-tracker, my open-source board where each ticket runs its own headless Claude Code session. This post is about one small piece of it: how the board knows an agent is alive.