data(emotion): GT corpus 60 → 534 tracks (electronic-leaning, +474, #93)

Overnight scale-up. A workflow fanned 24 opus subagents over genre cells —
electronic-heavy (Detroit/Chicago, modern techno, house, trance, dnb/jungle,
dubstep, garage, ambient, IDM, trip-hop, dub, synthwave, EDM, minimal, French
touch, hardcore, deconstructed, lofi) anchored by canon + diversity (hip-hop,
rock/metal, soul/funk, jazz, world, modern classical). 480 authored → 475 unique
→ 474 merged (1 dup, 0 invalid: schema enforcement on the 12-emotion vocab +
V/A range held perfectly).

Coverage: all 12 emotions, 289 genre tags, every V/A quadrant >> floor (thinnest
--=47). Labels ring true — Cybotron 'Clear' cold/hypnotic, 'Strings of Life'
euphoric, Jeff Mills 'The Bells' hypnotic/tense, de Witte dark/aggressive.

PLN's 'dataset size is the lever' — 9x the corpus for the scale calibration the
n=5/n=60 reads couldn't settle. Audio fetch/analyze runs overnight (disk-safe).