Use VexFlow staff engraving and match training tokenization for motif realizations

Remove result banners and collapse generation diagnostics

Favor motif recurrence before note variety when selecting candidates

Omit redundant natural signs from concrete motif prefill

Generate all twelve candidates and rank motif matches by note variety

Fix staff keyboard focus, simplify editor copy, and anchor cat to visible viewport

Add editable barlines to concrete motif staff and prompts

Retain motif preamble in ABC exports and expose the exact model prefill

Make contour points draggable, simplify staff selection, and add walking cat

Add visual contour builder and draggable staff motif editor