v8: Lock checkboxes for auto-tune — constrain any parameter during search

v7: Add Auto-Tune button — self-supervised parameter optimization

v6: Update app defaults for real music — delta=0.12, energy=-35, min_gap=0.03, NCC compare=0 (auto)

v5: target cluster range + caching + average linkage — app.py

v4: app.py entry point

v3: app.py entry point

v2: Update app.py entry point

Add app.py