# Progress Log: Worker M2 Fix 1

**Last visited**: 2026-10-01T20:45:00Z  
**Status**: Verification in Progress  

## Completed Steps
- [x] Initialized workspace and recorded dispatch instructions.
- [x] Read ORIGINAL_REQUEST.md (§ 2026-10-01T19:19:13Z - R2).
- [x] Read Explorer reports: explorer_m2_fix_1, explorer_m2_fix_2, explorer_m2_fix_3.
- [x] Initialized BRIEFING.md with mandatory lock sections.
- [x] Implemented 4-plane SAT Diamond Culling + 8 slots (`MAX_SLOTS = 8`) in `client/webapp/js/engine/tile_map_renderer.js` (294 lines, <= 320 lines cap).
- [x] Added 0x0 viewport early return and extreme pan guard in `tile_map_renderer.js`.
- [x] Updated `tools/perf/map_render_benchmark.js` to full diagonal traversal, 50 stationary frames at (30,30) with 0 re-bakes, RAM budget <= 16.5 MB (187 lines, <= 200 lines cap).
- [x] Updated `tools/perf/stress_test_lru_cache.js` for 8 slots / 16.5 MB RAM budget.
- [x] Verified `node tools/perf/map_render_benchmark.js` (PASS with exit code 0).
- [x] Verified `node tools/perf/stress_test_lru_cache.js` (PASS with exit code 0, 8/8 gates pass).
- [x] Verified `pytest tests/e2e/test_poe2_map_system_e2e.py -v` (81/81 PASS).
- [x] Verified `pytest tests/unit/test_waypoint_safe_radius.py -v` (17/17 PASS).
- [x] Verified `pytest tests/unit/test_wilderness_map_generator.py -v` (26/26 PASS).
- [x] Verified `pytest tests/unit/ -q` (935/935 PASS in 81.81s).
- [x] Verified `python tools/lint/check_code_and_doc_hygiene.py --strict` (0 violations).

## Current Step
- [x] Completed all implementation and verification steps. Ready for handoff.

## Upcoming Steps
- [ ] Finalize `BRIEFING.md` and write self-contained 5-component `handoff.md`.
- [ ] Send completion message to parent orchestrator.