# BRIEFING — 2026-10-01T02:52:30Z

## Mission
Analyze architecture and implementation design of LevelProgressionService & Death Penalty (Milestone M2) covering `level_progression_types.py` and `level_progression_service.py`.

## 🔒 My Identity
- Archetype: Teamwork Explorer
- Roles: Read-only investigation, architectural analysis, synthesis, structured handoff
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_m2_progression_1
- Original parent: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Milestone: M2 (LevelProgressionService & Death Penalty)

## 🔒 Key Constraints
- Read-only investigation — do NOT implement or modify main codebase source code
- Files for content delivery, Messages for coordination
- Follow Diátaxis & 2026 Elite Code Standards (Strict typing, dataclass slots=True frozen=True, max file length limits)
- Keep `level_progression_types.py` <= 350 lines, `level_progression_service.py` <= 350 lines (soft cap), <= 500 lines (hard cap)

## Current Parent
- Conversation ID: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Updated: 2026-10-01T02:52:30Z

## Investigation State
- **Explored paths**:
  - `server/world/game_design_matrix_service.py` & `server/world/game_design_matrix_seeder.py`
  - `server/world/level_progression_curve.py`
  - `server/world/combat_engine.py` & `server/world/ascendancy_catalog.py`
  - `tests/e2e/test_level_progression_e2e.py`
  - `tests/unit/test_game_design_matrix.py`
  - `tools/lint/check_code_and_doc_hygiene.py`
- **Key findings**:
  - Verified `progression_benchmarks` in `data/game_design_matrix.db` contains 100 rows.
  - Confirmed 3 tests in `test_level_progression_e2e.py` (F05) form the exact contract for `LevelProgressionService`.
  - Identified dual-protocol attribute matching needed between dispatch requirements and E2E test assertions (`effective_exp`, `level_up_occurred`, `new_exp` via `object.__setattr__` in `__post_init__`).
  - Identified parameter normalization needed in `award_monster_exp` to support both 4-positional call patterns and keyword arguments.
  - Verified death penalty safe floor calculation (`exp_lost = min(curr, loss)`, `exp_after = max(0, curr - loss)`).
- **Unexplored areas**:
  - Milestones M3, M4, M5 (deferred to their respective dedicated milestone teams).

## Key Decisions Made
- Fully specified `server/world/level_progression_types.py` (~110 lines) and `server/world/level_progression_service.py` (~270 lines).
- Formatted technical deliverables into `report.md` and `handoff.md`.

## Artifact Index
- `DISPATCH.md` — Ingested dispatch instructions
- `BRIEFING.md` — Situational awareness and state
- `progress.md` — Heartbeat and activity log
- `report.md` — Comprehensive architectural specification and design
- `handoff.md` — 5-component handoff report for parent orchestrator