cleanup: drop redundant checkbox default, add process_fn docstring, remove MuScriptor-repo gitignore entry

.gitignore

@@ -2,4 +2,3 @@ __pycache__/
 *.pyc
 .DS_Store
 .venv/
-MuScriptor-repo/

app.py

@@ -75,6 +75,7 @@ def process_fn(
     use_sampling: bool,
     temperature: float,
 ) -> str:
+    """Transcribe the input audio to a MIDI file and return its path."""
     model = _get_model(variant)
     instruments = _parse_instruments(instruments_text)
 
@@ -107,7 +108,6 @@ with gr.Blocks() as demo:
             info="Comma-separated instrument names to restrict decoding to, e.g. acoustic_piano,violin,trumpet,drums,etc. Leave blank to let the model detect instruments on its own.",
         ),
         gr.Checkbox(
-            value=False,
             label="Use Sampling",
             info="Temperature sampling instead of greedy decoding (default: False, per repo).",
         ),