# Progress: Challenger M5 1

Last visited: 2026-10-01T22:43:00Z

## Status
Empirical stress-testing of `grid_pathfinder.js` completed. Verdict: REQUEST_CHANGES. Writing handoff report.

## Tasks
- [x] Step 1: Initialize briefing and progress tracking
- [x] Step 2: Zero-Heap Allocation Check (5,000 rapid queries on 120x90 grid in Node.js: 0 GC events, 0 retained heap growth)
- [x] Step 3: Obstacle Avoidance & Corner-Cutting Verification (L-shape, U-shape, Mazes: 0 impassable steps, 0 corner cuts. Discovered High-severity path truncation bug on paths > 64 steps)
- [x] Step 4: DDA Line-of-Sight Stress Test (10,000 raycasts: 0 NaNs, 100% agreement on short range. Discovered Critical-severity `safety=64` false-positive LoS bug on rays >= 64 steps)
- [x] Step 5: Run existing collision & E2E pytest suites (`test_encounter_zones.py`, `test_tile_collision.py`, `test_poe2_map_system_e2e.py`: 104/104 PASSED)
- [x] Step 6: Create empirical test harness `tools/perf/stress_test_grid_pathfinder.js` (270 lines, passes strict hygiene)
- [ ] Step 7: Write `handoff.md` with explicit verdict `REQUEST_CHANGES`
- [ ] Step 8: Send completion message to parent