6205a6de0a
- Add ReviewState enum (pending, approved, changes_requested, etc.) - Add DEFAULT_REVISION constant for git HEAD references - service/pr/reviews.rs: use ReviewState for review creation and submission state validation - service/pr/core.rs: use MergeStrategyKind for merge strategy selection - service/im/stages.rs: use StagePrivacyLevel for stage creation - service/im/invitations.rs: use Role enum for invitation role defaults