[music] Resolve artist identity before splitting (fd86a11a)

PROJECT.org

@@ -612,7 +612,7 @@ favorited media objects.
 *** Description
 As an example https://comicbookroundup.com/comic-books/reviews/humanoids-publishing/the-history-of-science-fiction
 
-** TODO [#A] Add an exception list of artists as a constant that are exempted from splitting :music:artists:metadata:
+** DONE [#A] Add an exception list of artists as a constant that are exempted from splitting :music:artists:metadata:
 :PROPERTIES:
 :ID:       fd86a11a-73ec-470d-b5e3-2d90ba9137c8
 :END:
@@ -623,6 +623,22 @@ Certain artists like "Simon & Garfunkel" are actually one artist. While we don't
 tracks into featured artists, we should have a "LITERAL_ARTIST_TITLES" constant that can have exceptions like
 this put into it and then we stop trying to pull the artist apart when we run into it.
 
+*** Notes
+
+Instead of a hardcoded exception list, we resolve artist identity before
+splitting on " & ":
+
+  - `resolve_artist_names()` in music/utils.py keeps an artist string literal
+    when a MusicBrainz artist id is provided (webhooks), when the full string
+    already exists as an Artist, or when it matches a single MusicBrainz
+    artist (e.g. "Simon & Garfunkel" is a Group). Splitting on " & " is now a
+    last resort for genuine collaborations.
+  - `Track.find_or_create()` and `Track.fix_metadata()` use the resolved name
+    instead of always splitting.
+  - `reconcile_split_artists` management command repairs tracks already split
+    by the old logic, using the raw artist data stored in scrobble logs, and
+    deletes orphaned fragment artists.
+
 ** TODO [#A] Update how board game scrobbles work :boardgames:
 
 *** Description