## Forensic Audit Report

**Work Product**: Milestone 2: Automated Anti-Regression & Linter Suite (`tools/lint/check_i18n_hygiene.py`, `tests/unit/test_i18n_event_bus.py`, `tests/e2e/test_i18n_reactive_switching_e2e.py`)  
**Profile**: General Project  
**Integrity Mode**: Development (per `ORIGINAL_REQUEST.md` ## 2026-10-02T01:42:06Z)  
**Verdict**: **CLEAN**

---

### Phase Results

- **[Check 1: Hardcoded Output Detection]**: **PASS**  
  Source code in `tools/lint/check_i18n_hygiene.py`, `tests/unit/test_i18n_event_bus.py`, and `tests/e2e/test_i18n_reactive_switching_e2e.py` contains zero hardcoded test outputs, canned PASS/FAIL return codes, or hardcoded expected strings circumventing evaluation.
- **[Check 2: Facade Implementation Detection]**: **PASS**  
  All methods and modules implement real functional logic: AST/regex parsing of JS catalogs, dynamic Node.js VM harness importing real ES modules (`i18n.js`, `chat_ui.js`), and actual browser automation via Playwright.
- **[Check 3: Pre-populated Artifact Detection]**: **PASS**  
  No pre-populated test logs, cached results, or static attestations exist. All tests run dynamically from clean state.
- **[Check 4: Adversarial Linter Mutation & Strict Enforcement]**: **PASS**  
  Tested `check_i18n_hygiene.py` with synthetic unlocalized Vietnamese string (`Xin chào người chơi dã man`). The linter immediately flagged the violation `[RULE-1-HARDCODED-VI]` and exited with code `1` under `--strict`.
- **[Check 5: Independent Security Audit Gate]**: **PASS**  
  Executed `python tools/security/run_independent_security_audit.py --build-id "AUDIT-M2-I18N" --env STAGING`. Result: 0 Critical, 0 High vulnerabilities across 4 automated adversarial vectors.
- **[Check 6: Code & Document Hygiene Compliance]**: **PASS**  
  Executed `python tools/lint/check_code_and_doc_hygiene.py --strict`. All Milestone 2 files comply with the $\le 350$ lines soft cap:
  - `tools/lint/check_i18n_hygiene.py`: 337 lines
  - `tests/unit/test_i18n_event_bus.py`: 328 lines
  - `tests/e2e/test_i18n_reactive_switching_e2e.py`: 193 lines
- **[Check 7: i18n Hygiene Static Verification]**: **PASS**  
  Executed `python tools/lint/check_i18n_hygiene.py --strict`. Result: 0 violations across Rule 1 (Zero Hardcoded VI), Rule 2 (9-Language Parity), and Rule 3 (Missing / Dangling Keys).
- **[Check 8: Unit Test Suite Execution]**: **PASS**  
  Executed `pytest tests/unit/test_i18n_event_bus.py -v`. 23 / 23 test cases passed in 0.39s.
- **[Check 9: Browser E2E Test Execution]**: **PASS**  
  Executed `pytest tests/e2e/test_i18n_reactive_switching_e2e.py -v`. 1 / 1 passed in 5.93s. Zero page reloads confirmed (`window.__sessionNavCount === 1`), 0 unhandled console/page errors.
- **[Check 10: Regression Test Suite Execution]**: **PASS**  
  Executed existing test suites:
  - `pytest tests/unit/test_challenger_chat_m2.py tests/unit/test_challenger_m2_chat_adversarial.py` $\rightarrow$ 20 / 20 passed.
  - `pytest tests/unit/test_challenger_i18n_reactive_chat.py` $\rightarrow$ 9 / 9 passed.
  - `pytest tests/unit/test_challenger_i18n_m1_parity.py` $\rightarrow$ 14 / 14 passed.
  - `pytest tests/e2e/test_ui_typography_i18n_wiki_streamlining_e2e.py` $\rightarrow$ 60 / 60 passed.
  Total regression tests: 103 / 103 passed.

---

### Evidence

#### 1. Security Audit Tool Output
```
🛡️  FREEEXILE INDEPENDENT SECURITY & ANTI-CHEAT OPERATIONS DIVISION
🔒 Initiating Autonomous Independent Security Audit for: AUDIT-M2-I18N
🌐 Target Environment: STAGING
# BÁO CÁO KIỂM TOÁN AN NINH ĐỘC LẬP (SEC-OPS AUDIT REPORT)
> Audit ID: AUDIT-6855250D
> Phiên bản Build: AUDIT-M2-I18N | Môi trường: STAGING
> Phán quyết An ninh: 🟢 ĐẠT CHUẨN (PASSED)
- Tổng số ca tấn công mô phỏng: 4
- Lỗ hổng Critical: 0 (Ngưỡng Veto: > 0)
- Lỗ hổng High: 0 (Ngưỡng Veto: > 0)
✅ SECURITY RELEASE GATE PASSED: Zero Critical/High vulnerabilities detected.
```

#### 2. Code & Doc Hygiene Tool Output
```
[*] FREEEXILE CODE & DOCUMENT HYGIENE AUDIT REPORT
...
================================================================================
✅ KẾT QUẢ: TOÀN BỘ MÃ NGUỒN VÀ TÀI LIỆU TUÂN THỦ HARD CAP HYGIENE!
================================================================================
Exit code: 0
```

#### 3. i18n Static Linter Output
```
================================================================================
FREEEXILE I18N HYGIENE & ANTI-REGRESSION AUDIT REPORT
================================================================================
[*] Total Target Files Scanned: 4
[*] Rule 1 (Zero Hardcoded VI Strings) Violations: 0
[*] Rule 2 (9-Language Parity) Violations        : 0
[*] Rule 3 (Missing / Dangling Keys) Violations  : 0
--------------------------------------------------------------------------------
================================================================================
✅ SUCCESS: 100% i18n hygiene compliance. All rules passed cleanly!
================================================================================
Exit code: 0
```

#### 4. Adversarial Mutation Test Output
```
================================================================================
FREEEXILE I18N HYGIENE & ANTI-REGRESSION AUDIT REPORT
================================================================================
[*] Total Target Files Scanned: 4
[*] Rule 1 (Zero Hardcoded VI Strings) Violations: 1
[*] Rule 2 (9-Language Parity) Violations        : 0
[*] Rule 3 (Missing / Dangling Keys) Violations  : 0
--------------------------------------------------------------------------------
  ❌ [RULE-1-HARDCODED-VI] .agents\teamwork\auditor_i18n_m2_1\temp_bad_ui.js:3 - Hardcoded Vietnamese string detected: 'Xin chào người chơi dã man'
     Snippet: const title = "Xin chào người chơi dã man";
================================================================================
FAILED: Found 1 internationalization hygiene error(s).
================================================================================
Exit code: 1
```

#### 5. Unit Test Output
```
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_01_listener_registration_and_callback PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_02_multiple_listeners_isolated PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_03_listener_exception_resilience PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_04_listener_unsubscription PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_05_custom_event_window_dispatch PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_06_exact_locale_lookup PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_07_fallback_chain_current_to_en PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_08_fallback_chain_en_to_vi PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_09_fallback_to_raw_key PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_10_parameter_substitution PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_11_all_9_locales_present PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_12_vi_en_dictionary_parity PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_13_all_8_channel_keys_present PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_14_chat_permission_keys_present PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_15_chat_rarity_and_element_keys_present PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_16_chat_ui_subscribes_to_i18n_bus PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_17_language_change_updates_all_channel_tabs PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_18_language_change_updates_placeholder_and_cooldown PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_19_language_change_updates_send_button PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_20_language_change_preserves_chat_history PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_21_invalid_locale_handled_gracefully PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_22_localstorage_persistence PASSED
tests/unit/test_i18n_event_bus.py::TestI18nEventBusAndReactivity::test_23_null_or_empty_key_resilience PASSED
============================= 23 passed in 0.39s ==============================
```

#### 6. E2E Test Output
```
tests/e2e/test_i18n_reactive_switching_e2e.py::TestI18nReactiveSwitchingE2E::test_e2e_live_reactive_language_switching_zero_reload PASSED [100%]
============================== 1 passed in 5.93s ==============================
```