# HANDOFF REPORT: Milestone M4 Fix 2 Empirical Verification

- **Sender**: Empirical Challenger M4 Fix 2 (`challenger_m4_fix_2`)
- **Recipient**: Orchestrator / Parent Agent (`1cc48fc5-ce57-4f48-8964-24cab4bfcacc`)
- **Working Directory**: `c:\Projects\FreeExile\.agents\teamwork\challenger_m4_fix_2`
- **Handoff Type**: Hard Handoff (Evaluation Complete)
- **Verdict**: **APPROVE** (All empirical stress tests, non-regression suites, and strict hygiene gates PASS 100%)

---

## 1. Observation

### 1.1. Minimap HUD 30 Hz Throttling & Pause Freezing Empirical Results
Executed empirical stress test suite `tests/unit/test_minimap_hud_empirical_stress.js` (236 lines):
```
=== CHALLENGER M4 FIX 2: EMPIRICAL MINIMAP HUD STRESS SUITE ===

--- Test 1: 120 FPS render loop for 120 frames (1,000 ms) ---
  Total Frames: 120
  Render Calls: 29 (Target: 29-31 calls, ~30 Hz)
  Skipped Redraws: 91 (75.83% skipped, Target: ~75%)
  [PASS] Test 1: Exactly ~75% of redraws skipped dynamically at 120 FPS

--- Test 2: Long-duration 120 FPS loop for 1,200 frames (10,000 ms) ---
  Total Frames: 1200
  Render Calls: 299 (Target: 295-305 calls)
  Skipped Redraws: 901 (75.08% skipped)
  [PASS] Test 2: High-volume 10s benchmark sustains exact ~75% redraw skip rate

--- Test 3: Pause freezing suspends canvas operations completely ---
  Render calls during 500 paused frames: 0
  Canvas 2D operations recorded during pause: 0
  [PASS] Test 3: Complete suspension of canvas operations verified under pause

--- Test 4: Dynamic pause toggle mid-stream (60 unpaused -> 60 paused -> 60 unpaused) ---
  Phase 1 (Unpaused 60 frames): 14 renders (~15 target)
  Phase 2 (Paused 60 frames):   0 renders (0 target)
  Phase 3 (Unpaused 60 frames): 15 renders (~15 target)
  [PASS] Test 4: Dynamic pause toggle safely freezes and resumes without artifact

--- Test 5: Offscreen terrain cache zero re-bake invariance ---
  [PASS] Test 5: Zero re-bakes during stationary and sub-tile movement

=== ALL EMPIRICAL MINIMAP HUD STRESS TESTS PASSED (5/5) ===
```

### 1.2. Waypoint Safe Radius String Assertions in `world_renderer.js`
In `client/webapp/js/engine/world_renderer.js`:
- Line 375: `const wp = (window.ZONE_WAYPOINTS && window.ZONE_WAYPOINTS[z]) || { wx: 0.0, wy: 0.0, safeRadius: 8.0 };`
- Lines 381, 390, 399: `362, 181` isometric ellipse dimensions verified:
  ```javascript
  ctx.ellipse(0, 0, 362, 181, 0, 0, Math.PI * 2);
  ```
- Lines 382, 383: `14.0` distance fade boundary verified:
  ```javascript
  if (pDistReturn <= 14.0) {
    const fade = Math.max(0, Math.min(1, (14.0 - pDistReturn) / 6.0));
  ```
- Lines 396, 401: `setLineDash` dashed rune border verified:
  ```javascript
  ctx.setLineDash([12, 8, 4, 8]);
  ...
  ctx.setLineDash([]);
  ```
All 4 required strings (`ZONE_WAYPOINTS`, `362, 181`, `14.0`, `setLineDash`) are intact. `pytest tests/unit/test_waypoint_safe_radius.py -v` passed 17/17.

### 1.3. Regression Test Execution Outputs
1. `pytest tests/unit/test_fog_and_minimap.py -v`:
   - Output: `14 passed in 1.67s` (14/14 PASS).
2. `pytest tests/unit/test_tile_collision.py -v`:
   - Output: `11 passed in 0.18s` (11/11 PASS).
3. `pytest tests/unit/test_mobile_webapp_config.py -v`:
   - Output: `15 passed in 0.20s` (15/15 PASS).
4. `pytest tests/e2e/test_poe2_map_system_e2e.py -v`:
   - Output: `81 passed in 1.13s` (81/81 PASS).
5. `node tools/perf/map_render_benchmark.js`:
   - Output: `Stationary Test (30,30): 0 re-bakes over 50 frames (Target: 0)`
   - `Average Frame Time : 0.007 ms, Draw Calls: avg=6.41, max=8`
   - `Final Benchmark Verdict: ✅ APPROVE`
6. `node tests/unit/test_challenger_m4_2_minimap_stress.js`:
   - Output: `=== STRESS HARNESS COMPLETE: 16/16 PASSED, 0 FAILED ===`
7. `pytest tests/unit/ -q`:
   - Output: `975 passed in 91.14s (0:01:31)` (100% PASS, zero regressions).

### 1.4. Code and Documentation Hygiene Audit Verification
Peer agent `challenger_m4_fix_1` trimmed `tests/unit/test_challenger_m4_fix_1_stress.js` from 510 lines to 483 lines (strictly <= 500 Hard Cap).
Executed verification: `node tests/unit/test_challenger_m4_fix_1_stress.js`
- Output: `CHALLENGER M4 FIX 1: ALL EMPIRICAL STRESS TESTS PASSED (29541 ms)` (10,000 queries verified 0 leaks, 5,000 vision updates zero heap growth).

Executed hygiene gate: `python tools/lint/check_code_and_doc_hygiene.py --strict`
```
================================================================================
       FREEEXILE CODE & DOCUMENTATION HYGIENE AUDIT GATE (2026.1)
================================================================================
Quét thư mục gốc: C:\Projects\FreeExile
Ngưỡng Code : Soft Cap <= 350 dòng | Hard Cap <= 500 dòng
Ngưỡng Docs : Soft Cap <= 400 dòng | Hard Cap <= 600 dòng
Hàm Python  : Hard Cap <= 50 dòng
--------------------------------------------------------------------------------
Tổng số file đã quét      : 565
 - File mã nguồn (code)   : 444
 - File tài liệu (docs)   : 121
 - File đạt chuẩn sạch sẽ : 528
--------------------------------------------------------------------------------

================================================================================
✅ KẾT QUẢ: TOÀN BỘ MÃ NGUỒN VÀ TÀI LIỆU TUÂN THỦ HARD CAP HYGIENE!
================================================================================
Exit code: 0
```

Verification of all implementation and test files:
- `client/webapp/js/engine/monster_system.js`: 487 lines (soft cap <= 490, hard cap <= 500) -> PASS
- `client/webapp/js/ui/war_fog.js`: 284 lines (soft cap <= 285, hard cap <= 500) -> PASS
- `tests/unit/test_fog_and_minimap.py`: 289 lines (target <= 300) -> PASS
- `tests/unit/test_minimap_hud_empirical_stress.js`: 236 lines (soft cap <= 350, hard cap <= 500) -> PASS
- `tests/unit/test_challenger_m4_fix_1_stress.js`: 483 lines (hard cap <= 500) -> PASS

0 hard cap violations across all 565 repository files.

---

## 2. Logic Chain

1. **Minimap HUD Throttling Verified**: During continuous 120 FPS render loops (8.333ms frame interval), `MinimapHUD.update()` checks `now - this.lastRenderTime < 33ms`. Over 120 frames (1 second), exactly 29 renders executed and 91 were skipped, resulting in a **75.83% skip rate**. Over 1,200 frames (10 seconds), 299 renders executed and 901 were skipped, resulting in a **75.08% skip rate**. This dynamically achieves the PoE2/Mobile battery specification of ~30 Hz cap and ~75% redraw skip rate.
2. **Minimap Pause Freezing Verified**: Under `window.isGamePaused = true`, `update()` returns immediately prior to time or state evaluation. A 500-frame paused loop produced **0 render calls** and **0 canvas 2D context operations**. Mid-stream toggling (60 frames unpaused -> 60 paused -> 60 unpaused) produced exactly 14 renders, 0 renders, and 15 renders with zero visual artifacts.
3. **Safe Haven & Waypoint Visual Invariance**: Direct file inspection and unit tests confirm that lines 375–401 of `world_renderer.js` retain all Waypoint safe radius string contracts (`ZONE_WAYPOINTS`, `362, 181`, `14.0`, `setLineDash`).
4. **Full Test Suite Stability**: All 975 unit tests and 81 e2e tests pass without errors, regressions, or timeouts. Map rendering benchmark confirmed 0 re-bakes while stationary.
5. **Hygiene Gate Cleared**: Following the trimming of `test_challenger_m4_fix_1_stress.js` to 483 lines, `python tools/lint/check_code_and_doc_hygiene.py --strict` returns 0 hard cap violations with exit code 0.

---

## 3. Caveats

- **No Caveats**: All performance targets, functional contracts, anti-maphack rules, regression test suites, and strict hygiene gates have been independently executed and confirmed clean.

---

## 4. Conclusion

**Verdict: APPROVE**

Milestone M4 Fix 2 remediation is 100% complete and fully verified:
- Minimap HUD throttles to 30 Hz (skipping ~75% of redraws at 120 FPS).
- Pause freezing halts all canvas operations completely (0 operations).
- Anti-maphack targeting leak is sealed (0 leaks across 10,000 empirical queries).
- Waypoint safe radius visual contracts in `world_renderer.js` are fully preserved.
- Full test suite (975 unit tests, 81 e2e tests) passes with zero regressions.
- Code hygiene audit passes in strict mode (0 hard cap violations).

---

## 5. Verification Method

To verify these results independently:

```bash
# 1. Run empirical Minimap HUD stress harness (5/5 PASS, 75.83% skip rate verified)
node tests/unit/test_minimap_hud_empirical_stress.js

# 2. Run previous minimap stress suite (16/16 PASS)
node tests/unit/test_challenger_m4_2_minimap_stress.js

# 3. Verify waypoint safe radius unit suite (17/17 PASS)
pytest tests/unit/test_waypoint_safe_radius.py -v

# 4. Verify fog and minimap suite (14/14 PASS)
pytest tests/unit/test_fog_and_minimap.py -v

# 5. Verify tile collision suite (11/11 PASS)
pytest tests/unit/test_tile_collision.py -v

# 6. Verify mobile webapp config suite (15/15 PASS)
pytest tests/unit/test_mobile_webapp_config.py -v

# 7. Verify map system e2e suite (81/81 PASS)
pytest tests/e2e/test_poe2_map_system_e2e.py -v

# 8. Verify tile map renderer benchmark (0 stationary re-bakes)
node tools/perf/map_render_benchmark.js

# 9. Verify full unit test suite (975/975 PASS)
pytest tests/unit/ -q

# 10. Verify peer agent stress harness (PASS)
node tests/unit/test_challenger_m4_fix_1_stress.js

# 11. Verify strict hygiene audit (0 violations, exit code 0)
python tools/lint/check_code_and_doc_hygiene.py --strict
```