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.

README.md

@@ -38,13 +38,14 @@ localization files. Details in `docs/`.
 ackit find joker tape                             # search by name, category or character
 ackit extract Speech_TAPE_JOKER_1_04 orig.wav     # listen to the original (a line has one name in every language)
 ackit replace Speech_TAPE_JOKER_1_04 my_line.wav --match-loudness
-ackit revert Speech_TAPE_JOKER_1_04               # or: ackit revert --all
-ackit text find --lang INT protocol               # subtitles and menu texts (keys SUB:... / MENU:...)
+ackit revert Speech_TAPE_JOKER_1_04               # or: ackit revert --all (every sound and text)
+ackit text find --lang INT protocol               # subtitles and menu texts (keys SUB:... / MENU:...; any of the
+                                                  # 11 languages, e.g. --lang JPN)
 ackit text set "MENU:INT:FRONTEND.int:Buttonpress:DoubleTap" "Tap twice"
 ```
 More: `ackit status`, `ackit list --character Joker`, `ackit export-mod my.acmod` / `ackit import-mod`,
 `ackit verify` (offline self-check), `ackit verify --catalog` (catalog vs game files), `ackit game` (detected
-install, language, store). `ackit -h` lists all commands. The game folder is found through Steam (Windows, Linux, Flatpak, Proton); otherwise pass `--game DIR`.
+install, language, store), `ackit restore-backup` (last resort if the originals store is damaged). `ackit -h` lists all commands. The game folder is found through Steam (Windows, Linux, Flatpak, Proton); otherwise pass `--game DIR`.
 
 Rules worth knowing: speech/effects replacements must fit in the original's size (the tool squeezes or refuses
 with the maximum length); music can be any length. Subtitles must fit the original text's length (menu text: