# Progress: Challenger M5 Fix 1

Last visited: 2026-10-01T22:55:00Z
Status: In Progress

## Tasks
- [x] Initialized DISPATCH.md and BRIEFING.md
- [x] Read ORIGINAL_REQUEST.md, challenger_m5_1 handoff, worker_m5_fix_1 handoff, GEMINI.md, AGENTS.md
- [x] Inspect actual source changes in `client/webapp/js/engine/grid_pathfinder.js`
- [x] Run `node --expose-gc tools/perf/stress_test_grid_pathfinder.js`
- [x] Write and run custom adversarial empirical stress tests for Long-Range DDA Raycasting (70-120 tiles, various angles, grazing walls)
- [x] Write and run custom adversarial tests for A* Path Reconstruction Buffer (extreme length, serpentine mazes, first waypoint adjacency)
- [x] Test Zero-Heap Allocation over 5,000 rapid queries with GC tracking (0 GC events)
- [x] Run regression test suites:
  - `pytest tests/unit/test_encounter_zones.py -v` (16/16 passed)
  - `pytest tests/unit/test_tile_collision.py -v` (11/11 passed)
  - `pytest tests/e2e/test_poe2_map_system_e2e.py -v` (81/81 passed)
- [x] Hygiene audit: `python tools/lint/check_code_and_doc_hygiene.py --strict` (0 hard cap violations)
- [x] Write handoff.md with final verdict (APPROVE)
- [x] Send message to parent