Перевод не возобновляем: --all переводит все главы заново, механизм progress не работает

SKILL.md

@@ -180,8 +180,16 @@ is the bridge: it writes the repo's input format, shells out to
 
    `python scripts/translate.py book.html book.ru.html --repo <clone> --workdir <dir> --workers 12`
 
-   Resumable: the external repo tracks completed chapters and skips them on a
-   re-run, so an interrupted run costs nothing to restart.
+   ⚠️ **Not resumable, despite what the external repo claims.** Its
+   `progress/translation_progress.json` stays `{"chapters": {}}` and `--all`
+   re-translates every chapter, including ones already sitting in
+   `translations/`. Measured 2026-08-21 on Stroustrup: a re-run to repair 4
+   failed chapters re-did all 29. Budget a full book on every restart, and
+   prefer getting one clean run over patching a partial one.
+
+   The one thing that *does* skip work: deleting a chapter from `extracted/`
+   before the run. It is then never sent, and `rebuild` keeps the original
+   English for it — the right treatment for an index.
 4. **Read the reported counts.** "без перевода" above zero means a chapter came
    back with a different paragraph count and kept its original text; "разметка
    потеряна" counts paragraphs where the model mangled the inline-tag markers