Full correctness check against the docs: safer writes, reverts and texts

Safety
- Writes are serialized (Workspace.lock): two background jobs rebuilding one
  package (a sound and its subtitle applied side by side) lost an edit.
- A store copies a bank file or package as "original" only if it matches the
  shipped catalog (Workspace.unoriginal_files: in-memory sounds, bank copies of
  voice lines, subtitles); the editor refuses to switch stores while changes
  are applied. A second store could otherwise resurrect a reverted sound.
- Mod import in the editor asks before overwriting files changed outside the
  tool (it forced silently).
- Revert all in the editor reverts texts too; the uninstaller counts text
  edits before offering to delete the store.
- ackit restore-backup: the full-backup restore decisions.md described; it
  keeps the sounds of WADs without a full copy recorded.
- build_catalog also stops when a subtitle differs from the catalog.

Languages and texts
- Game.language() returns languages without voices (JPN, RUS, ...) and
  Game.voice_archive() their INT voices; ackit text --lang JPN works.
- Menu lookups parse one cached file (find & replace: minutes -> ms).
- Subtitles decode cp1252 as Windows does: the UTF-8-in-cp1252 line
  Speech_TAPE_J_Answer_1_00 (KOR/POL/POR/RUS) is written back byte-for-byte;
  SUB_KOR/SUB_RUS rebuilt from the original game (only those rows changed).
- Mods exported while another language is loaded keep name and line.

Other fixes
- Down-mix folds extra channels in at -3 dB (a 5.1 centre voice was dropped).
- e2e_editor no longer overwrites the user's settings.json; kill_game waits
  for the game to exit before reverts.
- Recorder handles Int32/UInt8 input and split frames; package block cache
  locked; conflict messages, CLI help examples, stale docstrings and doc
  references fixed; tests no longer read this PC's game language.

Docs (decisions, user guide, README, subtitles.md, banks.md, catalog README,
REPORT, NOTES, CLAUDE.md) updated; check_docs: 102 claims match. 148 tests;
e2e_features 9/9, e2e_editor and verify PASS; game original afterwards.

tests/test_game.py

@@ -46,3 +46,17 @@ def test_not_a_game_folder(tmp_path):
     import pytest
     with pytest.raises(G.GameError):
         G.Game(str(tmp_path))
+
+
+def test_language_without_voices(synth_game, tmp_path, monkeypatch):
+    """A game set to a language with texts only (e.g. JPN) is in that language, with the INT voices."""
+    root, _ = synth_game
+    os.makedirs(os.path.join(root, "BmGame", "Localization", "JPN"), exist_ok=True)
+    cfg = tmp_path / "cfg"
+    cfg.mkdir()
+    (cfg / "UserEngine.ini").write_bytes("[Engine.Engine]\r\nLanguage=Jpn\r\n".encode("utf-16"))
+    monkeypatch.setattr(G.Game, "config_dirs", lambda self: [str(cfg)])
+    g = G.Game(root)
+    assert g.language() == "JPN" and g.voice_archive(g.language()) == "INT"
+    from ackit.catalog import Catalog
+    assert "INT" in Catalog(g).archives                       # the default catalog loads the INT voices