Long-running jobs lack heartbeat/timeout

[codihuston]

Cause: No task-level heartbeat or execution timeout policy.
Analysis: Long tasks can stall pools and mask failures.
Acceptance Criteria:

• Task execution times out or emits heartbeat signals.
• Stuck tasks are detected and retried or failed safely.
  Solution Approach:
• Add per-task timeouts and heartbeat updates.
• Monitor for stale "running" tasks.