# BRIEFING — 2026-10-01T02:51:30Z

## Mission
Investigate LevelProgressionService integration with combat death and monster kill hooks, state persistence, death penalty edge cases, and formulate concrete recommendations for Worker M2.

## 🔒 My Identity
- Archetype: explorer
- Roles: teamwork_preview_explorer
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_m2_progression_2
- Original parent: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Milestone: M2 (LevelProgressionService & Death Penalty)

## 🔒 Key Constraints
- Read-only investigation — do NOT implement
- Strictly read-only investigation — do NOT modify project source code
- File size caps: logic <= 350 lines (soft) / 500 lines (hard)
- No blocking calls in event loop (SLA p99 < 25ms)
- .agents/teamwork/ holds only metadata, never source/test code
- Send completion message to parent via send_message

## Current Parent
- Conversation ID: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Updated: not yet

## Investigation State
- **Explored paths**:
  - `server/world/combat_engine.py` (fatal damage handling, `DamageEventResult`, `CombatActor`)
  - `server/world/zone_engine.py` (spatial boundaries, safe havens, player respawn/evacuation)
  - `server/world/server_engine_loop.py` (30Hz tick pipeline, combat phase)
  - `server/world/level_progression_curve.py` (7-segment EXP curve, benchmarks)
  - `server/world/game_design_matrix_service.py` (SQLite benchmarks & integrity)
  - `tests/e2e/test_level_progression_e2e.py` (F03-F05 contracts, death penalty edge cases)
- **Key findings**:
  - Decoupled observer callback in `CombatEngine` avoids circular imports and eliminates blocking calls in the 30Hz loop.
  - Adding `is_fatal: bool = False` to `DamageEventResult` provides explicit lethal hit indication.
  - Player progression state must be maintained in-memory in `LevelProgressionService` using frozen DTOs (`@dataclass(slots=True, frozen=True)`).
  - Death penalty is mathematically verified: percentage applies to level delta $\Delta_{level}$, clamping to safe floor at 0% with `de_leveled = False` invariant.
  - Test suite expects dual attribute compatibility (`effective_exp`/`exp_awarded`, `level_up_occurred`/`leveled_up`, `new_exp`/`current_exp_after`).
- **Unexplored areas**: None for M2 scope; ready for Worker M2 implementation.

## Key Decisions Made
- Formulated concrete implementation specifications in `report.md` and `handoff.md`.
- Ready to dispatch completion notification to parent orchestrator.

## Artifact Index
- DISPATCH.md — Initial dispatch message
- BRIEFING.md — Persistent context & identity
- progress.md — Liveness heartbeat
- report.md — Comprehensive investigation report
- handoff.md — 5-component handoff report