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/build_catalog.py

@@ -12,7 +12,8 @@ Outputs
   data/catalog/SUB_locations.csv.gz    every stored copy of each subtitle string
   data/catalog/index.json       fingerprints the CSVs were built from + counts
 Run it only on clean game files (`ackit status` must say nothing is modified). It stops before writing
-anything if a sound differs from the current catalog (a modified game); after a game update use --accept-changes.
+anything if a sound or a subtitle differs from the current catalog (a modified game); after a game update use
+--accept-changes. (Menu text has no catalog.)
 """
 import argparse
 import collections
@@ -88,9 +89,16 @@ def build_characters(game, src_root, final):
     return rows, unmatched, ambiguous, skipped
 
 
-def changed_since_catalog(game, out_dir, bank_snd):
-    """Keys whose original checksum in the existing catalog differs from the game files now."""
+def changed_since_catalog(game, out_dir, bank_snd, texts=None):
+    """Keys whose original in the existing catalog differs from the game files now: sounds (checksums) and
+    subtitles (texts: {lang: [SubLine]} scanned now)."""
     out = []
+    for lang, rows in (texts or {}).items():
+        p = os.path.join(out_dir, "SUB_%s.csv" % lang)
+        if os.path.exists(p):
+            old = {(s.speech, s.line): s.text for s in subtitles.read_texts(p, lang)}
+            out += [subtitles.key(lang, s.speech, s.line) for s in rows
+                    if (s.speech, s.line) in old and old[(s.speech, s.line)] != s.text]
     for arch, path in game.archives.items():
         p = os.path.join(out_dir, "%s.csv" % arch)
         if not os.path.exists(p):
@@ -133,11 +141,12 @@ def main():
     for k, d in lines.issues[:10]:
         print("  issue:", k, d)
 
-    # safety: the catalog records ORIGINAL bytes. A sound that differs from the current catalog means a modified
-    # game (an applied change, another tool) unless the game itself was updated -> stop before writing anything.
-    changed = changed_since_catalog(game, out_dir, bank_snd)
+    # safety: the catalog records ORIGINAL bytes and texts. A sound or subtitle that differs from the current
+    # catalog means a modified game (an applied change, another tool) unless the game itself was updated -> stop
+    # before writing anything.
+    changed = changed_since_catalog(game, out_dir, bank_snd, texts)
     if changed and not a.accept_changes:
-        print("STOP: %d sound(s) differ from the current catalog, e.g. %s." % (len(changed), changed[:5]))
+        print("STOP: %d sound(s) or subtitle(s) differ from the current catalog, e.g. %s." % (len(changed), changed[:5]))
         print("Revert all changes (ackit status / ackit revert --all) and run again; after a game update use "
               "--accept-changes.")
         sys.exit(2)
@@ -193,7 +202,7 @@ def main():
         "fingerprint": banks.game_fingerprint(game.cooked), "sounds": len(sounds), "groups": dict(g),
         "named_by_event": by_event, "named_by_bank": len(sounds) - by_event,
         "copies": sum(1 for l in locs if l.kind == banks.MEMORY), "files": len(sc.files),
-        # bank copies of WAD recordings: prefetch heads and whole in-memory copies (catalog._whole_recordings)
+        # bank copies of WAD recordings: prefetch heads and whole in-memory copies (catalog.whole_recordings)
         "prefetch_heads": {"recordings": len({l.media for l in heads}), "copies": len(heads),
                            "unmapped": len({l.media for l in heads if not l.sound})},
         "issues": ["%s: %s" % i for i in sc.issues]}