TEST-GAP-001: Loop override POST with UUID _id
TEST-GAP-002: Loop override DELETE by UUID
TEST-GAP-003: Loop override UPDATE by UUID
TEST-GAP-004: Loop override re-POST (upsert)
12 new tests validating REQ-SYNC-072 behavior:
- UUID _id promoted to identifier field
- Server generates valid ObjectId for _id
- Updates/deletes work via identifier lookup
- Duplicate detection via identifier
- Batch and edge case handling
New fixtures:
- loop-override.js: Real Loop override payload patterns
All 12 tests passing.
Refs: GAP-TREAT-012, REQ-SYNC-072
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>