# BRIEFING — 2026-10-02T02:38:00Z

## Mission
Implement Milestone 2: Automated Anti-Regression & Linter Suite (R3) for i18n system, including static analyzer, 23-test unit test suite, and E2E reactive switching test.

## 🔒 My Identity
- Archetype: worker
- Roles: implementer, qa, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\worker_m2_1
- Original parent: 0361e281-a64e-4264-a674-2b16c804009d
- Milestone: Milestone 2 — Automated Anti-Regression & Linter Suite (R3)

## 🔒 Key Constraints
- Exclusive write ownership files:
  - tools/lint/check_i18n_hygiene.py (336 lines <= 350 soft cap)
  - tests/unit/test_i18n_event_bus.py (327 lines <= 350 soft cap)
  - tests/e2e/test_i18n_reactive_switching_e2e.py (192 lines <= 350 soft cap)
- Quantitative length limits: Python logic <= 350 lines soft cap, max 500 lines hard cap.
- Strict typing, genuine implementations (no dummy/facade or hardcoded test results).
- python tools/lint/check_i18n_hygiene.py --strict must exit 0. (VERIFIED: PASS code 0)
- pytest tests/unit/test_i18n_event_bus.py (all 23 tests) must pass. (VERIFIED: PASS 23/23 in 0.37s)
- pytest tests/e2e/test_i18n_reactive_switching_e2e.py must pass. (VERIFIED: PASS in 5.71s)
- python tools/lint/check_code_and_doc_hygiene.py --strict must exit 0. (VERIFIED: PASS code 0)

## Current Parent
- Conversation ID: 0361e281-a64e-4264-a674-2b16c804009d
- Updated: 2026-10-02T02:38:00Z

## Task Summary
- **What to build**:
  1. Static linter `tools/lint/check_i18n_hygiene.py`: Vietnamese diacritics scan in UI js, 9-lang dictionary parity verification, missing key resolution for HTML data-i18n/data-chat-i18n, CLI flags (--strict, --json-out).
  2. Unit test suite `tests/unit/test_i18n_event_bus.py`: 23 comprehensive tests in 5 groups (Observer/Event Bus mechanics, Fallback chaining & interpolation, 9-lang dictionary parity & key presence, Chat UI reactive DOM integration without reload, Edge cases & storage).
  3. E2E test suite `tests/e2e/test_i18n_reactive_switching_e2e.py`: Automated reactive switching test asserting zero reload, dynamic DOM updates, 0 console errors.
- **Success criteria**: All linters & tests pass without error; <= 350 lines per file; genuine logic.
- **Interface contracts**: c:\Projects\FreeExile\.agents\teamwork\orchestrator_13\PROJECT.md
- **Code layout**: tools/lint/, tests/unit/, tests/e2e/

## Key Decisions Made
- Implemented static analyzer with syntax-aware comment stripping, fallback parameter allowlisting, and robust brace-depth dictionary parser.
- Engineered 23 unit tests driven by an in-memory Node.js ES module evaluation harness with zero-dependency simulated DOM.
- Implemented Playwright E2E browser test on dynamic port with navigation counters ensuring 0 reloads and 0 console errors.

## Artifact Index
- `tools/lint/check_i18n_hygiene.py` — Static hygiene checker (336 lines)
- `tests/unit/test_i18n_event_bus.py` — Unit test suite with 23 tests (327 lines)
- `tests/e2e/test_i18n_reactive_switching_e2e.py` — Browser E2E reactive switching test (192 lines)
- `c:\Projects\FreeExile\.agents\teamwork\worker_m2_1\implementation_report.md` — Detailed implementation report
- `c:\Projects\FreeExile\.agents\teamwork\worker_m2_1\handoff.md` — Standard 5-component handoff report
- `c:\Projects\FreeExile\.agents\teamwork\worker_m2_1\progress.md` — Progress log

## Change Tracker
- **Files modified**:
  - `tools/lint/check_i18n_hygiene.py`: Created static analyzer enforcing Rules 1, 2, 3
  - `tests/unit/test_i18n_event_bus.py`: Created 23 unit tests across 5 groups
  - `tests/e2e/test_i18n_reactive_switching_e2e.py`: Created browser E2E test
- **Build status**: PASS (all suites 100% green)
- **Pending issues**: None

## Quality Status
- **Build/test result**: All 23 unit tests, 1 E2E test, 20 legacy chat tests, and 60 typography tests PASS cleanly.
- **Lint status**: 0 violations in `check_i18n_hygiene.py`, `check_code_and_doc_hygiene.py` exits 0.
- **Tests added/modified**: 24 new test cases added (23 unit + 1 E2E).

## Loaded Skills
- None