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- Gate3: Replace loose grep (matched "0/25 failed" summary) with precise [FAIL] marker counting + "N test(s) failed" pattern - test_api.py: Add .env credential loading for gate check automation - test_api.py: Fix REST status codes (POST→201, DELETE→204) - test_api.py: Add 204 empty body handling, dynamic ID, pre-cleanup - Add gate_log.jsonl tracking to all 7 gates - Add knowledge graph restructure changelog Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>