- Derive engineStopped from globalPaused/enginePaused in App and pass through Board → Column → WorktreeGroup → TaskCard
- Guard isAgentActive in TaskCard with !engineStopped so the pulse animation stops when the engine is paused
- Update Board test to supply the new engineStopped prop
- Add TaskCard tests covering engineStopped=true, false, and undefined (backward compat)
- Add engineStopped to all intermediate component interfaces
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