# Progress — explorer_m1_3

Last visited: 2026-09-30T23:40:30Z
Status: Complete
Phase: Handoff Ready

## Steps
- [x] Record DISPATCH.md
- [x] Initialize BRIEFING.md
- [x] Read ORIGINAL_REQUEST.md, PROJECT.md, and explorer_survey_2/handoff.md
- [x] Inspect existing `tests/unit/test_zone_monster_spawning_rules.py` and `server/world/zone_engine.py`
- [x] Inspect related files (`zone_types.py`, `zone_catalog.py`, `spatial_grid.py`, etc.)
- [x] Design comprehensive, non-flaky test suite expansion for Milestone 1
- [x] Validate test assertions in simulation
- [x] Write handoff.md and update BRIEFING.md and progress.md
- [x] Notify caller via send_message