ConvertToCappedCoordinator has _mustAlwaysMakeProgress() returning false during phases where critical section is already held. If a non-retriable error occurs in these phases AND cleanup fails before persisting the abort reason, the coordinator gives up without cleaning up, leaving critical sections held indefinitely.

Failure scenario

• Coordinator acquires critical section at kAcquireCriticalSectionOnCoordinator.
• Failure occurs at a later phase where _mustAlwaysMakeProgress() is still false.
• triggerCleanup is called but fails before persisting the abort reason.
• Coordinator gives up (no retry because _mustAlwaysMakeProgress() is false).
• Critical section remains held, blocking CRUD operations indefinitely.