# Progress — Challenger 2 (Milestone 2)

Last visited: 2026-10-04T04:20:00Z
Status: Verification Complete - Verdict formulated (APPROVE).

## Checklist
- [x] Received dispatch and initialized BRIEFING.md & progress.md
- [x] Read ORIGINAL_REQUEST.md, PROJECT.md, and inspect implementation in `app/static/bim/index.html`
- [x] Inspected existing tests and worker handoff
- [x] Authored empirical adversarial test harness in `tools/verification/test_adversarial_m2_dock_and_resize.py`
- [x] Test 1: 50x dock expansion and collapse toggle (195px / 32px height, 0 layout flickering, rapid burst resilience) -> 100% PASSED
- [x] Test 2: Zero Occlusion across 5 viewport resolutions (1920x1080 to 800x600, dockRect.right <= sidebarRect.left, overlap = 0px) -> 100% PASSED
- [x] Test 3: Mobile viewport resize (375x667 and extreme 320x568, camera.aspect not NaN/Infinity, projection matrix valid) -> 100% PASSED
- [x] Test 4: Mathematical zero-dimension safeguard edge cases -> 100% PASSED
- [x] Test 5: Site Diary Dock synchronous updates while collapsed and re-expanded -> 100% PASSED
- [x] Test 6: Audit console and unhandled exceptions (0 errors, 0 warnings) -> 100% PASSED
- [x] Executed Check 5 & Check 6 Playwright tests -> 100% PASSED (2/2)
- [x] Executed Architecture Boundary Enforcement tests -> 100% PASSED (5/5)
- [x] Formulated verdict: APPROVE
- [ ] Write handoff.md in working directory
- [ ] Send message to parent orchestrator with verdict