# BRIEFING — 2026-10-01T03:02:00Z

## Mission
Implement LevelProgressionService, LevelProgressionTypes, CombatEngine integration, Unit Tests, and E2E verification for Milestone M2. (TASK COMPLETE)

## 🔒 My Identity
- Archetype: teamwork_preview_worker
- Roles: implementer, qa
- Working directory: c:\Projects\FreeExile\.agents\teamwork\worker_m2_progression_1
- Original parent: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Milestone: M2 (LevelProgressionService & Death Penalty)

## 🔒 Key Constraints
- Follow 2026 Elite Code Standards: strict typing 100%, `@dataclass(slots=True, frozen=True)`, async safety, no dummy/facade implementations.
- File ownership:
  * `server/world/level_progression_types.py` (new)
  * `server/world/level_progression_service.py` (new)
  * `server/world/combat_engine.py`
  * `tests/unit/test_level_progression_service.py` (new)
  * `tests/e2e/test_level_progression_e2e.py`
- Line length limits: <= 350 lines (soft cap), <= 500 lines (hard cap).
- Pass all unit tests, E2E tests (F03, F04, F05), mypy, hygiene check, security audit.
- Unxfail F05 tests in `tests/e2e/test_level_progression_e2e.py`.

## Current Parent
- Conversation ID: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Updated: 2026-10-01T03:02:00Z

## Task Summary
- **What to build**: LevelProgressionService & LevelProgressionTypes, CombatEngine integration with fatal damage detection and progression service attachment, comprehensive unit tests, un-xfail E2E tests.
- **Success criteria**: All tests pass, 100% strict mypy pass, hygiene and security audit pass, no regressions.
- **Interface contracts**: PROJECT.md, ORIGINAL_REQUEST.md, M2 explorer reports.
- **Code layout**: `server/world/` and `tests/`.

## Key Decisions Made
- [Initial]: Adopted verified architectures from explorer_m2_progression_1, 2, 3 reports.
- [Types]: Implemented `@dataclass(slots=True, frozen=True)` with property aliases for dual contract compatibility.
- [CombatEngine]: Implemented decoupled observer callback `on_fatal_damage` and `attach_progression_service` to avoid circular imports.
- [Hygiene]: Refactored all helper functions (`_compute_level_advancement`, `_calculate_mitigated_damage`, `_check_special_damage_cases`) to guarantee all function lengths <= 50 lines.

## Change Tracker
- **Files modified**:
  * `server/world/level_progression_types.py`: Created (102 lines)
  * `server/world/level_progression_service.py`: Created (336 lines)
  * `server/world/combat_engine.py`: Updated with is_fatal and progression hook (192 lines)
  * `tests/unit/test_level_progression_service.py`: Created 33 unit tests (296 lines)
  * `tests/e2e/test_level_progression_e2e.py`: Un-xfailed Feature F05 tests (404 lines)
- **Build status**: PASS (33/33 unit tests pass, 47/50 E2E tests pass with 3 M3 xfail, 80/83 combined pass)
- **Pending issues**: None for M2 (remaining 3 xfails are Milestone M3 scope)

## Quality Status
- **Build/test result**: PASS (Unit: 33/33, E2E F03-F05: 22/22, E2E Total: 47 pass, 3 xfail)
- **Lint status**: PASS (mypy: 0 errors in 4 source files; hygiene: exit 0, 100% hard cap compliant; security: exit 0, 0 critical/high)
- **Tests added/modified**: 33 unit tests in `tests/unit/test_level_progression_service.py`, 3 tests un-xfailed in `tests/e2e/test_level_progression_e2e.py`

## Artifact Index
- `DISPATCH.md` — Assignment instructions
- `BRIEFING.md` — Persistent working memory
- `progress.md` — Heartbeat and status
- `report.md` — Full implementation report
- `handoff.md` — 5-component handoff report