[PASS] Interface contract: specBaseIdMap['A_1'] = int ✓
[PASS] goods_params: stock=1, seat-level spec_base_id ✓
[PASS] Fallback strategy for Plan B transition ✓
[PASS] Seat label format matches backend regex ✓
[PASS] Price sources align between frontend and backend ✓
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Council