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.

docs/formats/banks.md

@@ -57,7 +57,7 @@ WAD sounds have such heads (2,101 copies); replacing one of them must rewrite th
 story lines) are
 also stored **whole** in banks: an in-memory source with the WAD recording's own media ID, byte-identical to
 the WAD WEM (84 copies). They are handled like heads: part of the WAD line, written and reverted with it, not
-sounds of their own (`catalog._whole_recordings`). Heads and whole copies together: 445 recordings, 2,185
+sounds of their own (`catalog.whole_recordings`). Heads and whole copies together: 445 recordings, 2,185
 copies (`BANK_locations.csv.gz` kind `p`).
 
 ## Localized banks

docs/formats/subtitles.md

@@ -14,6 +14,10 @@ the UE3 packages (`upk.md`), holding the subtitle text of all 11 languages. acki
   to 5 lines.
 - Strings are stored as cp1252 (positive FString length) or UTF-16 (negative length): almost all RUS, JPN and
   KOR strings and 85 % of POL are UTF-16; the other languages have 17-56 UTF-16 strings each.
+  4 cp1252 strings hold UTF-8 bytes instead (the same line in KOR, POL, POR, RUS: `Speech_TAPE_J_Answer_1_00`;
+  the KOR one with a damaged byte; the game's own data). ackit reads cp1252 as Windows maps it (every byte, also
+  the 5 that Python's cp1252 leaves undefined, which the RUS and KOR ones contain), so they are shown as stored
+  and every string is written back byte-for-byte.
 
 ## Scripted subtitles (`RSubtitle`)
 41 more subtitles (radio and encryption-card lines) are `RSubtitle` objects in `Startup.upk`: the same layout,