subwave: resolve duplicates after library additions unlocked new matches

User added several previously-recommended albums/compilations to the
library (AC/DC Ballbreaker, Rancid ...And Out Come the Wolves, Garbage,
Foo Fighters, Goo Goo Dolls, Melissa Etheridge x2, Big Shiny Tunes, MTV
Buzz Bin Vol. 2, etc.) and rescanned Navidrome. Re-running the matcher
across all 12 shows resolved many previous misses, which surfaced 6 new
cross-show duplicates (a song now matching in two shows at once). Each
was resolved by keeping the track on whichever show has its authentic/
better chart rank, matching the same policy used earlier this session.

Match counts after re-run: 1994 shows 13/29, 10/24, 10/27, 14/26; 1995
shows 22/30, 20/30, 19/30, 10/17; 1996 shows 17/35, 15/28, 19/29, 13/30.

Claude-Session: https://claude.ai/code/session_01L7Rwa6guD5wK8F8tWQwcJX

subwave/broadcasts/tunecaster-rock-1996-01-13.json

@@ -157,20 +157,25 @@
       "artist": "Don Henley",
       "title": "The Garden Of Allah"
     },
-    {
-      "rank": 32,
-      "artist": "Foo Fighters",
-      "title": "Big Me"
-    },
-    {
-      "rank": 33,
-      "artist": "Garbage",
-      "title": "Only Happy When It Rains"
-    },
     {
       "rank": 34,
       "artist": "Ruth Ruth",
       "title": "Uninvited"
+    },
+    {
+      "rank": 1,
+      "artist": "The Smashing Pumpkins",
+      "title": "1979"
+    },
+    {
+      "rank": 5,
+      "artist": "Collective Soul",
+      "title": "The World I Know"
+    },
+    {
+      "rank": 11,
+      "artist": "Spacehog",
+      "title": "In The Meantime"
     }
   ]
 }