## 2026-10-04T04:25:51Z
You are teamwork_preview_worker for Milestone 3 (Lifetime Video Export Engine - Feature F11).
Working directory: c:\Projects\DSCons\.agents\teamwork\teamwork_preview_worker_m3_1
Workspace root: c:\Projects\DSCons

MANDATORY INPUTS:
- Authoritative requirements: c:\Projects\DSCons\.agents\teamwork\ORIGINAL_REQUEST.md (YOU MUST READ THIS FILE FIRST).
- Project architecture & feature inventory: c:\Projects\DSCons\.agents\teamwork\teamwork_preview_orchestrator_1\PROJECT.md.
- Survey report: c:\Projects\DSCons\.agents\teamwork\teamwork_preview_explorer_survey_3\handoff.md (Detailed MediaRecorder captureStream investigation, 1080p buffer sizing, codec selection).
- Test script assertions: tools/verification/test_ong_den_4d_bim_and_video_export.py (Check 7).
- Engineering directives: c:\Projects\DSCons\.agents\AGENTS.md and c:\Projects\DSCons\GEMINI.md.

MANDATORY INTEGRITY WARNING:
DO NOT CHEAT. All implementations must be genuine. DO NOT hardcode test results, create dummy/facade implementations, or circumvent the intended task. A teamwork_preview_auditor will independently verify your work. Integrity violations WILL be detected and your work WILL be rejected.

EXCLUSIVE WRITE OWNERSHIP:
- c:\Projects\DSCons\app\static\bim\index.html
- c:\Projects\DSCons\app\api\middleware\security_middleware.py

YOUR TASK:
Implement Milestone 3 (Lifetime Video Export Engine - Feature F11 per ORIGINAL_REQUEST.md § R4 and PROJECT.md):
1. In `app/static/bim/index.html`:
   - Ensure renderer configuration includes `preserveDrawingBuffer: true`:
     `const renderer = new THREE.WebGLRenderer({ antialias: true, preserveDrawingBuffer: true });`
   - Add button `#btnExportVideo` (with alias `#btnRecordVideo`, class `.btn-export-video`) in the floating player dock or controls overlay:
     `<button class="btn btn-primary btn-export-video" id="btnExportVideo" onclick="exportLifetimeVideo()">🎬 Quay Video Lifetime (1080p)</button>`
   - Implement `exportLifetimeVideo()` (and expose `window.exportLifetimeVideo` and `window.startVideoExport`):
     * Disables the button and shows active recording feedback.
     * Sets internal WebGL buffer to Full HD 1080p: `renderer.setSize(1920, 1080, false)`.
     * Obtains canvas stream: `canvas.captureStream(30)`.
     * Selects supported MIME type: `video/mp4;codecs=avc1`, fallback `video/webm;codecs=vp9`, fallback `video/webm`.
     * Initializes `MediaRecorder(stream, { mimeType, videoBitsPerSecond: 6000000 })`.
     * Collects recording chunks via `ondataavailable`.
     * Sweeps camera smoothly along the curved 146.46m alignment while advancing timeline Day 1 to Day 90.
     * On stop, creates Blob (> 100 KB) and triggers direct download via `<a download="DSCons_BIM4D_Cong_Ong_Den_Lifetime.webm" href="...">.click()`.
     * Restores renderer size to original container dimensions and reenables button.
2. In `app/api/middleware/security_middleware.py`:
   - Append `media-src 'self' blob: data:;` to CSP header directives so blob videos are allowed by browser security policy.
3. Testing & Verification:
   - Run `pytest tools/verification/test_ong_den_4d_bim_and_video_export.py -v -k "test_check_7"`.
   - Run full 8-check E2E suite: `pytest tools/verification/test_ong_den_4d_bim_and_video_export.py -v`.
   - Run boundary gate: `pytest tests/test_architecture_boundary_enforcement.py -v`.
   - Verify 0 console errors.
4. Write handoff report to: `c:\Projects\DSCons\.agents\teamwork\teamwork_preview_worker_m3_1\handoff.md`.
5. Send message to parent orchestrator when complete.