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.

ackit/game.py

@@ -123,6 +123,14 @@ class Game:
     def languages(self):
         return [a for a in self.archives if a != "SFX"]
 
+    def voice_archive(self, lang):
+        """The speech archive used for a language: its own, or INT for the languages the game has no voices for
+        (the game plays the INT voices with their own subtitles and menu text)."""
+        lang = (lang or "INT").upper()
+        if lang in self.languages:
+            return lang
+        return "INT" if "INT" in self.languages else self.languages[0]
+
     def wad(self, archive):
         try:
             return self.archives[archive.upper()]
@@ -153,8 +161,16 @@ class Game:
             dirs.append(os.path.join(pfx, docs, "WB Games", "Batman Arkham City GOTY", "BmGame", "Config"))
         return [d for d in dirs if os.path.isdir(d)]
 
+    def all_languages(self):
+        """Every language of the game: the voice languages (speech WADs) and the text languages (folders of
+        BmGame/Localization; the game plays the INT voices for those without their own)."""
+        loc = _iglob_one(self.root, "BmGame", "Localization")
+        texts = [d.upper() for d in os.listdir(loc) if os.path.isdir(os.path.join(loc, d))] if loc else []
+        return sorted(set(self.languages) | set(texts))
+
     def language(self):
-        """Speech language the game is set to (falls back to INT, then the first available)."""
+        """The language the game is set to (voices or texts only, e.g. JPN; `voice_archive` gives its speech
+        archive); falls back to INT, then the first voice language."""
         for d in self.config_dirs():
             for f in ("UserEngine.ini", "BmEngine.ini"):
                 p = os.path.join(d, f)
@@ -163,7 +179,7 @@ class Game:
                 raw = open(p, "rb").read()
                 txt = raw.decode("utf-16") if raw[:2] in (b"\xff\xfe", b"\xfe\xff") else raw.decode("latin-1")
                 m = re.search(r"^\s*Language\s*=\s*(\w+)", txt, re.M | re.I)
-                if m and m.group(1).upper() in self.archives:
+                if m and m.group(1).upper() in self.all_languages():
                     return m.group(1).upper()
         if "INT" in self.archives:
             return "INT"