# BRIEFING — 2026-10-04T04:26:30Z

## Mission
Implement Milestone 3: Lifetime Video Export Engine (Feature F11) for DSCons 4D BIM viewer, including WebGL 1080p offscreen recording, MediaRecorder integration, UI trigger button, CSP policy update, and automated E2E test verification.

## 🔒 My Identity
- Archetype: teamwork_preview_worker
- Roles: implementer, qa, specialist
- Working directory: c:\Projects\DSCons\.agents\teamwork\teamwork_preview_worker_m3_1
- Original parent: befbfc73-5853-4a94-b280-61f27b35aa73
- Milestone: Milestone 3 (Lifetime Video Export Engine - Feature F11)

## 🔒 Key Constraints
- EXCLUSIVE WRITE OWNERSHIP:
  * c:\Projects\DSCons\app\static\bim\index.html
  * c:\Projects\DSCons\app\api\middleware\security_middleware.py
- DO NOT CHEAT: Genuine implementations only, real WebGL/MediaRecorder logic, real blob export, no dummy mocks.
- Automated regression & architecture gates must pass 100%.
- Zero console errors in browser.

## Current Parent
- Conversation ID: befbfc73-5853-4a94-b280-61f27b35aa73
- Updated: not yet

## Task Summary
- **What to build**: 1080p Lifetime Video Export Engine for Ong Den 4D BIM model with camera sweep & 90-day progress animation, download trigger, UI controls, CSP header allowance.
- **Success criteria**:
  * `pytest tools/verification/test_ong_den_4d_bim_and_video_export.py -v -k "test_check_7"` passes.
  * Full 8-check suite passes.
  * Architecture boundary tests pass.
- **Interface contracts**: c:\Projects\DSCons\.agents\teamwork\teamwork_preview_orchestrator_1\PROJECT.md
- **Code layout**: app/static/bim/index.html, app/api/middleware/security_middleware.py

## Key Decisions Made
- [TBD]

## Artifact Index
- DISPATCH.md — Assignment instructions
- progress.md — Liveness & step-by-step progress tracking
- handoff.md — Final 5-component handoff report

## Change Tracker
- **Files modified**: [TBD]
- **Build status**: [TBD]
- **Pending issues**: None

## Quality Status
- **Build/test result**: [TBD]
- **Lint status**: [TBD]
- **Tests added/modified**: tools/verification/test_ong_den_4d_bim_and_video_export.py (Check 7)

## Loaded Skills
- Source: c:\Projects\DSCons\.agents\skills\enterprise-ui-darkslate\SKILL.md
  * Core methodology: Dark Slate theme, dense controls, non-occluding UI.
- Source: c:\Projects\DSCons\.agents\skills\backend-clean-architecture\SKILL.md
  * Core methodology: Hexagonal boundaries, CSP & security middleware integrity.