Adds a songwriting craft and AI music prompt engineering skill covering
song structure, rhyme/meter, emotional arcs, Suno metatag reference,
phonetic tricks for AI singers, parody adaptation, and production workflow.
Complements existing music skills (heartmula, audiocraft, songsee) which
cover model setup/usage — this one covers the creative process itself.
Also removes the empty skills/music-creation/ category (only had a
DESCRIPTION.md, no actual skills).
Co-authored-by: 123mikeyd <123mikeyd@users.noreply.github.com>