## 2026-10-04T04:13:20Z
You are teamwork_preview_challenger 1 for Milestone 2 (4D BIM Simulation & Interactive Site Diary Dock).
Working directory: c:\Projects\DSCons\.agents\teamwork\teamwork_preview_challenger_m2_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.
- Target modified file: c:\Projects\DSCons\app\static\bim\index.html.
- Test runner: `tools/verification/test_ong_den_4d_bim_and_video_export.py`.
- Engineering directives: c:\Projects\DSCons\.agents\AGENTS.md and c:\Projects\DSCons\GEMINI.md.

YOUR TASK:
Adversarially stress-test the 4D timeline simulation playback:
1. Scrub timeline slider rapidly from Day 1 to Day 90 and backwards 100 times: verify 0 memory spikes, zero garbage collection drops, FPS remains > 30 FPS.
2. Test speed multipliers: 1x, 2x, 5x playback loops; verify smooth phase transitions.
3. Test edge days: Day 1 (baseline site), Day 26 (excavation start), Day 45 (bamboo completion 13,042), Day 70 (wall completion), Day 82 (slab completion), Day 90 (Larsen extracted, road restored).
4. Verify console logs for 0 errors or warnings.
5. Formulate your verdict: APPROVE or REQUEST_CHANGES with empirical evidence.
6. Write your handoff report to: `c:\Projects\DSCons\.agents\teamwork\teamwork_preview_challenger_m2_1\handoff.md`.
7. Send message to parent orchestrator with your verdict.