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.

tools/e2e_editor.py

@@ -5,6 +5,8 @@
 3. start the game under cdb + speaker loopback: the probe must be heard, no crash, setup parsed;
 4. press Revert (EditorPanel.revert) and check the WAD + pack index are byte-identical to before;
 5. also apply/revert a speech line in place and check byte identity.
+Uses the user's settings and originals store (an interrupted run shows up in `ackit status`); the settings file
+is never written.
 
     python tools/e2e_editor.py
 """
@@ -29,11 +31,15 @@ def sha(p):
 
 def main():
     from PySide6.QtWidgets import QApplication
+    from ackit import settings as settings_mod
     from app.mainwindow import MainWindow
     from app.workers import Runner
 
     app = QApplication([])
-    w = MainWindow(settings={"full_backup": True}, runner=Runner(sync=True))
+    # the user's settings (same game folder and originals store as `ackit status`), never saved: the window
+    # stores its settings on load and on close, which would overwrite the user's file with this test's ones
+    w = MainWindow(settings=dict(settings_mod.load(), full_backup=True), runner=Runner(sync=True))
+    w.save_settings = lambda: None
     w.confirm = lambda *a: True
     w.editor.confirm = lambda *a: True
     errors = []