fix: proper output file naming

tools/combine_tracks.py

@@ -280,7 +280,7 @@ def create_medley(
 
     if output_path is None:
         tmp_dir = tempfile.mkdtemp(prefix="mcp-medley-")
-        output = Path(tmp_dir) / "unidos_hyper_medley.mp3"
+        output = Path(tmp_dir) / f"{vocals.name}_{instrumental.name}_medley.mp3"
     else:
         output = Path(output_path).expanduser().resolve()
         output.parent.mkdir(parents=True, exist_ok=True)