Docs refresh: 178 everywhere, MUSIC-MIND in the README and layout

The genre count had drifted across four docs (~110 in README/CLAUDE, 17/17 in GENRE-SPACE, 32-genre in FAUST-PORT, 63/63 in a verifier comment — each true when written); all now say 178, with the historical measurements clarified rather than falsified.

▶ Play it: Highway Heat Death — where the synthesis is the identity, not the decoration https://stellate.app/?genre=synthwave&seed=5569&path=859.9909,878.9942,840.9942&xdur=13.122

f2a155f https://github.com/aboard-io/stellate/commit/f2a155f1ae526f68029037fd5d406f2d3f276b07