v1.9.0MajorReview lifecycle foundation
Added revision-aware transitions, review fields, and timeline-ready lifecycle events.

Added
- Canonical lifecycle transitions for submit, approve, deny, and resubmit flows.
- Time entry event records for user-facing session and review history.
- Revision-based conflict handling for critical mutations.
Improved
- More consistent status behavior across entry list, detail, and review actions.
- Better audit metadata validation.
Notes
Use detail and review views to verify transition results and reasons.