- handle contact PATCH failures by checking model save result and returning HTTP 400 with the model error message
- update ContactDetailModel nested updates to enforce active-detail checks and use model update() with explicit failure propagation
- extend contact patch assertions and align test-create variants expectations to status=success for POST responses
- refresh composer lock metadata/dependency constraints and include generated docs/data/test files updated during normalization
- impact: API contract unchanged except clearer 400 error responses on invalid contact detail updates
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