# Progress - Milestone 3 (Lifetime Video Export Engine)
Last visited: 2026-10-04T04:26:45Z

- [x] Initialized DISPATCH.md and BRIEFING.md
- [ ] Read mandatory inputs:
  - [ ] ORIGINAL_REQUEST.md
  - [ ] PROJECT.md
  - [ ] handoff.md from explorer survey 3
  - [ ] test_ong_den_4d_bim_and_video_export.py (Check 7)
- [ ] Inspect current files:
  - [ ] app/static/bim/index.html
  - [ ] app/api/middleware/security_middleware.py
- [ ] Implement CSP directive `media-src 'self' blob: data:;` in `app/api/middleware/security_middleware.py`
- [ ] Implement 1080p Video Export Engine in `app/static/bim/index.html`:
  - [ ] preserveDrawingBuffer: true
  - [ ] #btnExportVideo UI button
  - [ ] exportLifetimeVideo() / startVideoExport implementation with WebGL 1080p render, camera sweep, day progression, MediaRecorder chunks, blob download, and state restoration
- [ ] Execute tests:
  - [ ] `pytest tools/verification/test_ong_den_4d_bim_and_video_export.py -v -k "test_check_7"`
  - [ ] Full suite `pytest tools/verification/test_ong_den_4d_bim_and_video_export.py -v`
  - [ ] Architecture gate `pytest tests/test_architecture_boundary_enforcement.py -v`
- [ ] Write handoff.md and send message to orchestrator.