# Progress Log — teamwork_preview_challenger_m2_1

- **Last visited**: 2026-10-04T04:22:30Z
- **Status**: Stress-testing completed. Empirical verdict formulated: APPROVE.

## Completed Tasks:
1. [x] Step 1: Record dispatch, initialize BRIEFING.md and progress.md.
2. [x] Step 2: Read MANDATORY INPUTS:
   - `ORIGINAL_REQUEST.md`
   - `teamwork_preview_orchestrator_1/PROJECT.md`
   - `tools/verification/test_ong_den_4d_bim_and_video_export.py`
   - `app/static/bim/index.html`
3. [x] Step 3: Run existing automated test suite `tools/verification/test_ong_den_4d_bim_and_video_export.py` (7 passed, 1 failed on M4-scoped #btnExportVideo).
4. [x] Step 4: Verify live browser environment on `http://127.0.0.1:8000/static/bim/index.html` via `chrome-devtools-mcp`.
5. [x] Step 5: Adversarial Stress Test 1: Rapid scrubbing 100x (Day 1 <-> Day 90, 18,000 updates in 2.57s, 0.14ms/update, 0 geometry/texture leaks, memory delta -208 KB, unthrottled render 75.03 FPS > 30 FPS).
6. [x] Step 6: Adversarial Stress Test 2: Speed multipliers 1x, 2x, 5x loops and all 16 phase transition boundaries tested and verified.
7. [x] Step 7: Adversarial Stress Test 3: Edge days inspection (Day 1, 26, 45, 70, 82, 90) confirmed 100% compliant with contract HĐ-2026.
8. [x] Step 8: Console inspection: 0 errors, 0 warnings.
9. [x] Step 9: Formulate verdict: APPROVE.
10. [ ] Step 10: Write handoff.md and send message to parent orchestrator.