Game line names across languages; RSubtitle; editor in three columns

docs/decisions.md

@@ -103,6 +103,10 @@ copy per voice language) is filtered the same way, so the sound list never mixes
 - Shipped CSVs per archive (names, categories, characters, original size + checksum) make loading instant and
   enable change detection; any other build is scanned at runtime (header reads only, cached).
 - Verified speakers come only from the user's lists; name-based character inference is kept in a separate field.
+- Speech sounds are named after the game's line (speech event), not after their position in the WAD entry:
+  the WEMs of an entry are stored in media-ID order and every language has its own media IDs, so position i
+  is a different line in each language (75 % of the multi-variation lines). Line names make names, speaker
+  labels, mod packages and subtitles agree across languages.
 - Category scheme: `docs/categories.md`.
 
 ## 6. Repository cleanup choices