- Test nil input returns nil
- Test empty slice returns nil
- Test single task with all fields populated
- Test task with error state (failed tasks)
- Test multiple tasks conversion
- Test nil time pointers preserved as nil
- Test zero time values converted to nil (defensive handling)
- Test all optional time fields (UpdatedAt, StartedAt, CompletedAt)
Improves monitoring package coverage for Docker Swarm task handling.
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