# Handoff Report: Reviewer Assessment for Milestone M2

- **Agent**: `reviewer_m2_progression_1`
- **Roles**: reviewer, critic
- **Working Directory**: `c:\Projects\FreeExile\.agents\teamwork\reviewer_m2_progression_1`
- **Recipient**: `orchestrator_4` (`6f4a2aa2-4315-4660-8cb7-8352a7220c95`)
- **Date**: 2026-10-01T03:08:00Z
- **Verdict**: **REQUEST_CHANGES**

---

## 1. Observation

1. **Test & Static Analysis Execution**:
   - `pytest tests/unit/test_level_progression_service.py -v` -> 33 passed in 0.19s.
   - `pytest tests/e2e/test_level_progression_e2e.py -k "test_f03 or test_f04 or test_f05"` -> 22 passed, 28 deselected in 0.14s.
   - `python -m mypy --explicit-package-bases --follow-imports=silent server/world/level_progression_types.py server/world/level_progression_service.py server/world/combat_engine.py tests/unit/test_level_progression_service.py` -> `Success: no issues found in 4 source files`.
   - `python tools/lint/check_code_and_doc_hygiene.py --strict` -> Exit 0; `level_progression_types.py`: 103 lines, `level_progression_service.py`: 337 lines, `combat_engine.py`: 192 lines; 0 functions > 50 lines.

2. **Adversarial Stress Test: Level 100 Cumulative EXP Overflow**:
   - Command:
     ```powershell
     python -c "from server.world.level_progression_service import LevelProgressionService; s = LevelProgressionService(); s.set_player_state('test', level=99, current_exp=s.get_delta_exp(99) - 10); s.award_monster_exp('test', 100, 100, 1000000); info = s.get_level_info('test'); b100 = s.get_benchmark(100); print('diff:', info.cumulative_exp - b100.cumulative_exp)"
     ```
   - Verbatim Output: `diff: 999990`.
   - Source Code (`server/world/level_progression_service.py:253`):
     ```python
     cumulative_exp=player.cumulative_exp + exp_awarded,
     ```
     `cumulative_exp` is not clamped to `self.get_benchmark(100).cumulative_exp` when transitioning to Level 100.

3. **Adversarial Stress Test: Level 100 Death Penalty Event & State Swallowing**:
   - Command:
     ```powershell
     python -c "from server.world.level_progression_service import LevelProgressionService; s = LevelProgressionService(); p = s.set_player_state('test_lv100', level=100); events = []; s.add_death_penalty_listener(lambda r: events.append(r)); s.apply_death_penalty('test_lv100'); print('deaths:', s.get_level_info('test_lv100').deaths_count, 'events:', len(events))"
     ```
   - Verbatim Output: `deaths: 0 events: 0`.
   - Source Code (`server/world/level_progression_service.py:298-300`):
     ```python
     player = self.get_player_state(player_id)
     if player.level >= 100:
         return self._build_death_result(player, 0, 0.0, player.current_exp)
     ```
     Early return bypasses incrementing `player.deaths_count` and drops notification to `self._death_listeners`.

4. **Adversarial Stress Test: Negative Base EXP Injection**:
   - Command:
     ```powershell
     python -c "from server.world.level_progression_service import LevelProgressionService; s = LevelProgressionService(); s.set_player_state('p', level=10, current_exp=100); s.award_monster_exp('p', 10, base_exp=-100); print(s.get_level_info('p').current_exp)"
     ```
   - Verbatim Output: `99`.
   - Source Code (`server/world/level_progression_service.py:151-158`): `raw_exp` is not clamped to non-negative values.

---

## 2. Logic Chain

1. **From Observation 1**:
   The basic implementations in `level_progression_types.py`, `level_progression_service.py`, and `combat_engine.py` are properly structured, immutable, strictly typed, and adhere to code length hygiene constraints. No integrity violations (cheating, facade mocks, hardcoded test strings) were detected.
2. **From Observation 2**:
   The system requirements explicitly state: *"Level cap at 100: zero overflow past Level 100 cumulative EXP."* Because `_apply_exp_gain` blindly sums `player.cumulative_exp + exp_awarded` even when the character hits Level 100, the resulting `cumulative_exp` exceeded the benchmark cap by 999,990 EXP. This violates an explicit acceptance criterion.
3. **From Observation 3**:
   When a Level 100 character dies in combat, `deaths_count` remains 0 and registered death listeners are never invoked due to the premature return in `apply_death_penalty()`. In a production ARPG environment, death listeners handle respawns, hardcore permadeath migration, and analytics. Swallowing these callbacks at Level 100 introduces a high-impact behavioral fault.
4. **From Observation 4**:
   Lack of input sanitation on `raw_exp` in `award_monster_exp()` permits negative EXP awards, creating an unintended mechanism for EXP loss on monster kill.
5. **Conclusion**:
   Because of Findings 1 and 2 (one direct requirement violation and one high-impact death handling defect), Milestone M2 cannot be approved as currently implemented. The appropriate verdict is `REQUEST_CHANGES`.

---

## 3. Caveats

1. **Non-Regression on Passing Tests**: All 33 unit tests and 47 passing E2E tests remain valid and passing. The required modifications are localized to `level_progression_service.py` and will not break any existing test contracts.
2. **Milestone M3 Boundaries**: The 3 xfailed E2E tests (`test_f06_trial_10_rejected_at_level_99`, `test_f06_trial_10_accepted_at_level_100`, `test_f07_godhood_keystone_metamorphosis_flag`) are correctly scoped to Milestone M3 and are not considered defects of M2.

---

## 4. Conclusion

**Verdict: REQUEST_CHANGES**

Worker `worker_m2_progression_1` must address the following items before Milestone M2 can be approved:
1. Clamp `cumulative_exp` to `b100.cumulative_exp` when transitioning to Level 100 in `_apply_exp_gain()` and when setting state at Level 100 in `set_player_state()`.
2. Remove the early return for `player.level >= 100` in `apply_death_penalty()`, allowing `deaths_count` to increment and `_death_listeners` to be notified.
3. Sanitize `raw_exp = max(0, raw_exp)` in `_resolve_award_args()`.
4. Add unit test coverage for Level 100 cumulative EXP cap clamp and Level 100 death listener dispatch in `tests/unit/test_level_progression_service.py`.

---

## 5. Verification Method

To verify the requested changes:

1. **Test Level 100 Cumulative EXP Cap (Zero Overflow)**:
   ```powershell
   python -c "from server.world.level_progression_service import LevelProgressionService; s = LevelProgressionService(); s.set_player_state('t', level=99, current_exp=s.get_delta_exp(99) - 10); s.award_monster_exp('t', 100, 100, 1000000); info = s.get_level_info('t'); b100 = s.get_benchmark(100); assert info.cumulative_exp == b100.cumulative_exp, f'Overflow: {info.cumulative_exp - b100.cumulative_exp}'; print('ZERO OVERFLOW VERIFIED')"
   ```
   *Expected*: `ZERO OVERFLOW VERIFIED`.

2. **Test Level 100 Death Listener & Death Count**:
   ```powershell
   python -c "from server.world.level_progression_service import LevelProgressionService; s = LevelProgressionService(); s.set_player_state('t', level=100); events = []; s.add_death_penalty_listener(lambda r: events.append(r)); s.apply_death_penalty('t'); assert s.get_level_info('t').deaths_count == 1; assert len(events) == 1; print('DEATH TELEMETRY VERIFIED')"
   ```
   *Expected*: `DEATH TELEMETRY VERIFIED`.

3. **Run Full Test Suite**:
   ```powershell
   pytest tests/unit/test_level_progression_service.py -v
   pytest tests/e2e/test_level_progression_e2e.py -v
   python -m mypy --explicit-package-bases --follow-imports=silent server/world/level_progression_types.py server/world/level_progression_service.py server/world/combat_engine.py tests/unit/test_level_progression_service.py
   python tools/lint/check_code_and_doc_hygiene.py --strict
   ```