# Progress — Challenger M1 Fix 2

Last visited: 2026-10-01T20:02:30Z

## Status
- [x] Initialized workspace and briefing
- [x] Read ORIGINAL_REQUEST.md (section `## 2026-10-01T19:19:13Z`)
- [x] Read worker handoff (`worker_m1_fix_1/handoff.md`)
- [x] Inspect implementation and test files
- [x] Execute empirical verification commands (pytest & node)
  - `pytest tests/unit/test_challenger_m1_2_binary_compat.py -v`: 15/15 passed
  - `node -e "const { TileGridLoader } = require('./client/webapp/js/engine/tile_grid_loader.js'); console.log('Clean Node require OK');"`: PASSED
  - `node tests/unit/test_challenger_tile_grid_stress.js`: 48/48 passed
  - `pytest tests/unit/test_wilderness_map_generator.py -v`: 26/26 passed
  - `pytest tests/e2e/test_poe2_map_system_e2e.py -v`: 81/81 passed
- [x] Run edge-case / adversarial stress tests (byteOffset, 1x1 map, markChunkDirty hook, float boundaries)
- [x] Formulate findings, logic chain, and final verdict (APPROVE)
- [ ] Write handoff.md and notify parent