# BRIEFING — 2026-10-01T22:25:00Z

## Mission
Investigate terrain-anchored monster pack spawning, cohesive pack leashing, and zone encounter progress tracking for Milestone M5.

## 🔒 My Identity
- Archetype: teamwork_preview_explorer
- Roles: explorer, investigator, synthesizer
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_m5_1
- Original parent: 1cc48fc5-ce57-4f48-8964-24cab4bfcacc
- Milestone: M5

## 🔒 Key Constraints
- Read-only investigation — do NOT implement
- monster_system.js line budget <= 490 lines (Soft cap 350, Hard cap 500 lines)
- Report findings via report.md, handoff.md, and send_message to parent (1cc48fc5-ce57-4f48-8964-24cab4bfcacc)

## Current Parent
- Conversation ID: 1cc48fc5-ce57-4f48-8964-24cab4bfcacc
- Updated: 2026-10-01T22:25:00Z

## Investigation State
- **Explored paths**:
  - `client/webapp/js/engine/monster_system.js` (486 lines)
  - `client/webapp/js/engine/monster_pack_system.js` (134 lines)
  - `client/webapp/js/data/wilderness_zone_packs.js` (254 lines)
  - `client/webapp/js/engine/boss_gate_controller.js` (199 lines)
  - `client/webapp/js/engine/tile_grid_loader.js` (163 lines)
  - `server/world/wilderness_map_generator.py` (293 lines)
  - Test suites: `test_monster_poise_and_leash.py`, `test_waypoint_safe_radius.py`, `test_challenger_m3_script_and_aura_stress.py`, `test_poe2_map_system_e2e.py`
- **Key findings**:
  - `monster_system.js` line count is at 486, strictly tested at `<= 490` lines (4 lines headroom).
  - Terrain-anchored spawning must be delegated to `monster_pack_system.js` (134 lines) to prevent line cap violation.
  - Coordinate system divergence: legacy packs used static floats; procedural system uses `encounterZones` in `currentMapMetadata`.
  - Boss gate unlocking is already implemented in `boss_gate_controller.js:unlock()` and integrates with `window.zoneEncounterProgress`.
  - Invariants: `pack_tang_kiem_alpha` and `beta` regex patterns must remain in `wilderness_zone_packs.js`.
- **Unexplored areas**: None. Investigation complete.

## Key Decisions Made
- Formulated terrain-anchored pack generation, cohesive leashing (~9.0 tiles), and zone encounter progress tracking with boss gate unlock trigger.
- Established modular delegation architecture keeping `monster_system.js` at ~430 lines.

## Artifact Index
- DISPATCH.md — Assignment instructions
- BRIEFING.md — Persistent context & identity
- progress.md — Liveness heartbeat
- report.md — Comprehensive M5 exploration report
- handoff.md — 5-component handoff report