chore: switch binary assets to Git LFS tracking

Replace plain `binary` markers with `filter=lfs diff=lfs merge=lfs -text`
for all large binary extensions (.pt, .pth, .ckpt, .pkl, .mid, .midi,
.png, .jpg, .jpeg, .pdf, .zip, .gz, .tar).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitattributes

@@ -16,17 +16,17 @@
 *.cfg text eol=lf
 *.ini text eol=lf
 
-# Binary assets — never diff/merge
-*.pt binary
-*.pth binary
-*.ckpt binary
-*.pkl binary
-*.mid binary
-*.midi binary
-*.png binary
-*.jpg binary
-*.jpeg binary
-*.pdf binary
-*.zip binary
-*.gz binary
-*.tar binary
+# Binary assets — stored in Git LFS
+*.pt filter=lfs diff=lfs merge=lfs -text
+*.pth filter=lfs diff=lfs merge=lfs -text
+*.ckpt filter=lfs diff=lfs merge=lfs -text
+*.pkl filter=lfs diff=lfs merge=lfs -text
+*.mid filter=lfs diff=lfs merge=lfs -text
+*.midi filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text
+*.jpg filter=lfs diff=lfs merge=lfs -text
+*.jpeg filter=lfs diff=lfs merge=lfs -text
+*.pdf filter=lfs diff=lfs merge=lfs -text
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.gz filter=lfs diff=lfs merge=lfs -text
+*.tar filter=lfs diff=lfs merge=lfs -text