Agent Skills: cobuilder-heartbeat

Behavioral specification for the CoBuilder Heartbeat teammate. Loaded as prompt when spawning the Haiku work-finder agent within the session-scoped cobuilder-live-{hash} team. Defines the heartbeat loop scanning for actionable work (beads, orchestrator failures, git staleness, stale tasks, idle orchestrators, GChat replies) and reporting findings to CoBuilder via SendMessage.