**Phase 143 final verification pass — 100% green, no code changes needed (all work verified in-tree)** - **Verified implementation:** `COARSE_POINTER` constant (L395, L391-twin `typeof`-guarded shape) + gated finally-block focus `if (!COARSE_POINTER) input.focus({ preventScroll: true })` in `frontend/assets/app.js`; SETTLE lines/anchor untouched; extended unit pin in `test_frontend_scroll.py`; dedicated two-context E2E `tests/e2e/test_mobile_keyboard_focus.py` - **C1 desktop byte-identical refocus:** ✅ unit pin passes (gated shape keeps `preventScroll`); desktop E2E asserts composer active; `test_loading_feedback.py` 5 passed (phase-06 regression) - **C2 mobile keyboard stays down:** ✅ `test_mobile_turn_end_keeps_keyboard_down` passes — `pointer: coarse` sanity assert first, composer NOT active after done - **C3 gates:** ✅ `uv run pytest --cov=app --cov-report=term-missing` → 3359 passed, `app/` TOTAL 99% (>90%); `uv run pytest tests/e2e/test_mobile_keyboard_focus.py -v --no-cov` → 2 passed in isolation; `uv run ruff check .` clean; `uv run pyright` 0 errors - **C4 no regression:** ✅ full suite green (all frontend source pins: char counter, send flow, never-scroll); `test_stop_generation.py` 3 passed (single settle) - **Docs:** README.md fully reviewed — all env vars cross-checked against `app/config.py` defaults, routes/endpoints/tools verified in code; AGENTS.md rules + quick reference verified against repo. Consistent — no changes needed - **No live-infrastructure changes** (dev Postgres container already running) - **Next pending phase:** `144_modal_back_button`
