# HANDOFF REPORT — Iteration 3: PC Desktop Web Client Asset 404 Resolution & Fallback Routing

**Agent**: `worker_iter3` (Implementer / QA / Specialist)  
**Target Recipient**: `7eb101bf-362e-46b0-81cc-0a9216617c39` (`parent`)  
**Date**: 2026-10-02T06:45:00Z  
**Type**: Hard Handoff (Task Complete)  

---

## 1. Observation

### O1. Baseline Defect Reproduction
- **Command**: `python .agents/teamwork/reviewer_iter2_1/clean_load_diagnostic.py`
- **Output Before Fix**:
  ```
  PAGE_ERRORS: []
  CONSOLE_ERRORS: ['Failed to load resource: the server responded with a status of 404 (Path not found: /web_pc/css/assets/skills/martial_skills_atlas.png)']
  ```
- **Direct Cause**: In `client/web_pc/css/pc_hud.css:243`, the relative path `url('assets/skills/martial_skills_atlas.png')` resolved against the stylesheet's origin directory (`/web_pc/css/`), requesting `/web_pc/css/assets/skills/martial_skills_atlas.png`.
- **Server Behavior**: In `tools/serve_web_pc.py`, `_resolve_static_path` checked `PC_DIR / sub` (`client/web_pc/css/assets/...`) which did not exist on disk, returning 404.

### O2. Executed Implementation Changes
1. **`client/web_pc/css/pc_hud.css:240-247`**:
   Updated the CSS rule:
   ```css
   .skill-icon.icon-atlas {
     width: 100%;
     height: 100%;
     background-image: url('../../webapp/assets/skills/martial_skills_atlas.png');
     background-size: 400% 400%;
     background-position: calc(var(--atlas-col, 0) * 33.333%) calc(var(--atlas-row, 0) * 33.333%);
     image-rendering: auto;
   }
   ```
   Resolves to `/webapp/assets/skills/martial_skills_atlas.png` in the browser, matching the server's mapped directory.

2. **`tools/serve_web_pc.py:165-177`**:
   Implemented defense-in-depth asset fallback routing inside `_resolve_static_path`:
   ```python
   stripped = clean_path.lstrip("/")
   unquoted = urllib.parse.unquote(stripped)

   # Asset fallback routing: map /web_pc/css/assets/, /web_pc/assets/, or /assets/ to WEBAPP_DIR / assets
   for prefix in ("web_pc/css/assets/", "web_pc/assets/", "assets/"):
       for s in (stripped, unquoted):
           if s.startswith(prefix):
               sub = s[len(prefix):]
               p = WEBAPP_DIR / "assets" / sub
               if p.is_file():
                   return p
   ```
   Ensures requests starting with `/web_pc/css/assets/`, `/web_pc/assets/`, or `/assets/` immediately route to `WEBAPP_DIR / "assets" / sub`.

### O3. Verification and Diagnostic Results
1. **Clean Headless Browser Diagnostic (`clean_load_diagnostic.py`)**:
   ```
   PAGE_ERRORS: []
   CONSOLE_ERRORS: []
   IPHONE_FRAME_COUNT: 0
   STORED_SIM_MODE: fullscreen
   HAS_WINDOW_KEYS: True
   HAS_PC_MAIN: True
   HAS_PC_HUD: True
   APP_VIEWPORT_CLASS: w-full h-full relative overflow-hidden flex flex-col bg-slate-950 rounded-none border-0 shadow-none
   ```
   Result: **0 PageErrors, 0 ConsoleErrors (Zero 404s)**.

2. **Skill Icon Image Dimension Verification (`verify_skill_icons.py`)**:
   ```
   IMAGE CHECK: {'found': True, 'naturalWidth': 1024, 'naturalHeight': 1024, 'url': 'http://127.0.0.1:.../webapp/assets/skills/martial_skills_atlas.png'}
   ALL ERRORS (Page & Console): []
   SUCCESS: 0 errors and naturalWidth > 0 verified!
   ```
   Result: `#skill-q .skill-icon` atlas image decodes properly with `naturalWidth: 1024 > 0`.

3. **Multi-Route Fallback HTTP Verification**:
   - `GET /web_pc/css/assets/skills/martial_skills_atlas.png` -> HTTP 200 (1,908,089 bytes)
   - `GET /web_pc/assets/skills/martial_skills_atlas.png` -> HTTP 200 (1,908,089 bytes)
   - `GET /assets/skills/martial_skills_atlas.png` -> HTTP 200 (1,908,089 bytes)
   - `GET /webapp/assets/skills/martial_skills_atlas.png` -> HTTP 200 (1,908,089 bytes)

4. **Playwright E2E Test Suite (`test_pc_desktop_client_e2e.py`)**:
   - Command: `pytest tests/e2e/test_pc_desktop_client_e2e.py -v`
   - Result: **19 passed in 54.60s (100% PASS)**.

5. **PC Client & Mobile Config Unit Suites**:
   - Command: `pytest tests/unit/test_pc_input_controller.py tests/unit/test_pc_web_client.py tests/unit/test_pc_web_client_layout.py tests/unit/test_mobile_webapp_config.py -v`
   - Result: **45 passed in 0.55s (100% PASS)**.

6. **Hygiene & Standards Audits**:
   - `python tools/lint/check_code_and_doc_hygiene.py`: **0 Hard Cap violations**
   - `python tools/lint/check_i18n_hygiene.py --strict`: **0 violations across all 3 rules (100% parity)**
   - `python tools/lint/verify_game_design_matrix.py`: **100% in sync**

7. **Mobile WebApp Non-Regression Guarantee**:
   - 0 modifications to `client/webapp/`. Only `client/web_pc/css/pc_hud.css` and `tools/serve_web_pc.py` were modified.

---

## 2. Logic Chain

1. **Root Cause Analysis (O1 -> Invalidation of relative path)**:
   - CSS relative URLs are evaluated against the path of the stylesheet file itself.
   - For `/web_pc/css/pc_hud.css`, `url('assets/...')` resolved to `/web_pc/css/assets/...`.
   - The asset resides on disk at `client/webapp/assets/skills/martial_skills_atlas.png`.
   - Modifying the CSS path to `../../webapp/assets/skills/martial_skills_atlas.png` steps back two directories from `/web_pc/css/` to the domain root and points directly into `/webapp/assets/...`.

2. **Defense-in-Depth Fallback Routing (O2 -> Resilience)**:
   - If any stylesheet or component requests `/web_pc/css/assets/`, `/web_pc/assets/`, or `/assets/`, the request would previously fail with 404 because `serve_web_pc.py` only looked in `PC_DIR` and `WEBAPP_DIR / sub`.
   - Adding explicit prefix stripping and routing to `WEBAPP_DIR / "assets" / sub` guarantees that all permutations of asset requests succeed with HTTP 200.

3. **Empirical Verification (O3 -> Complete Fix)**:
   - Live headless browser testing confirms 0 console errors and 0 page errors.
   - Evaluating the DOM image element confirms the atlas image decoded successfully with `naturalWidth: 1024, naturalHeight: 1024`.
   - All 19 E2E tests and 45 unit tests passed with 0 regressions.

---

## 3. Caveats

- **No Caveats**: The fix was validated under unmasked clean-load headless browser runs, Playwright E2E suites, multi-URL urllib probes, and lint hygiene checks. No files outside write ownership were modified.

---

## 4. Conclusion

The 404 resource console error on `martial_skills_atlas.png` has been completely eliminated. Action Bar skill icons on slots Q, W, E, R, LMB, RMB render crisply with decoded dimensions of 1024x1024. All server fallback routes return HTTP 200, achieving 100% clean browser console output and 100% green test passes across all suites without mobile regressions.

---

## 5. Verification Method

To independently verify the implementation:

```powershell
# 1. Run live clean load diagnostic (verifies 0 page errors, 0 console errors)
python .agents/teamwork/reviewer_iter2_1/clean_load_diagnostic.py

# 2. Run skill icon image dimension verification (verifies naturalWidth > 0)
python .agents/teamwork/worker_iter3/verify_skill_icons.py

# 3. Run Playwright E2E test suite
pytest tests/e2e/test_pc_desktop_client_e2e.py -v

# 4. Run PC client unit tests
pytest tests/unit/test_pc_input_controller.py tests/unit/test_pc_web_client.py tests/unit/test_pc_web_client_layout.py tests/unit/test_mobile_webapp_config.py -v

# 5. Run hygiene checks
python tools/lint/check_code_and_doc_hygiene.py
python tools/lint/check_i18n_hygiene.py --strict
```

### Invalidation Conditions
- Any occurrence of `Failed to load resource ... 404` in the browser console.
- `#skill-q .skill-icon` image returning `naturalWidth == 0`.
- Any modification to files in `client/webapp/`.