[BUG] Test regression after Sprint 4 - cosmos_client check failing #20
Description
Test test_analysis_main_passes_cosmos_client FAILING after Sprint 4 merge (PR 19, commit a5e4246). Sprint 4 refactored main.py and removed FindingsAssembler pattern. New implementation uses upsert_item() directly without passing cosmos_client kwarg. Impact: 23/24 tests passing (was 24/24). C-04 regression guard bypassed. Options: (1) Update test to match new implementation, (2) Restore cosmos_client kwarg pattern, (3) Remove test if obsolete. Acceptance: All 24 tests passing, C-04 guard restored.