Completed the full GTM Engine implementation:\n\n- Implemented 'Dual Opener' (Primary/Secondary) generation in ClassificationService and DB.\n- Updated Frontend Inspector to display both openers.\n- Hardened analysis process (fixed duplicate scrapes, improved metric prompt).\n- Created robust, API-level E2E test script (test_opener_api.py).\n- Created a standalone health_check.py for diagnostics.\n- Updated all relevant documentation (README, GEMINI.md).
