# PROGRESS — Challenger M4 Fix 1

Last visited: 2026-10-01T22:12:00Z
Status: Completed

## Steps
- [x] Received dispatch instructions and initialized BRIEFING.md
- [x] Inspect `monster_system.js`, `war_fog.js`, `minimap_hud.js`, and `test_fog_and_minimap.py`
- [x] Run test 1: 10,000 randomized combat target acquisition queries in Node.js (0 leaks verified)
- [x] Run test 2: 5,000 rapid vision updates heap memory growth check (35.57 KB net growth, zero leak)
- [x] Run test 3: Base64 bit-packing on 120x90 maps with corrupted and invalid inputs (all passed)
- [x] Run test 4: `pytest tests/unit/test_fog_and_minimap.py -v` (14/14 PASS) & `pytest tests/e2e/test_poe2_map_system_e2e.py -v` (81/81 PASS)
- [x] Run regression test suite: `pytest tests/unit/ -q` (975/975 PASS) & hygiene audit (0 hard cap violations)
- [x] Synthesize findings and write handoff.md with explicit verdict APPROVE
- [x] Send completion message to parent