Balance loop 1: 19 -> 169 genres fully musical; reggae keeps its promise

The first run of the MUSICALITY balance loop (docs/MUSICALITY.md), mechanism-first per Paul's law that specific complaints are classes:

THE INTRO-DRAG WAS ONE LINE OF KERNEL — the duration solver's grow tie-break picked the first tied index, stacking ALL residual growth at the track's front

THE ONE-DROP EXISTS — KITS grows `onedrop` — kick + cross-stick TOGETHER on beat 3, beat 1 empty, hats on the skank off-eighths.

• chalkvespers stops asking its choir for midi 107 (ceiling 87): new zero-rng anchor dimension `leadOctave` (dominant-parent pick, absent = byte-identical), chant at -2 — asks within the window now

• PRELUDE OPENS ON THE FIGURATION, BAR 1 (introMode off): the wave arrive-node held the first keyboard note out 37-101s (seed 3: 101s, bass at 202s).

▶ Play it: Third Beat Gravity → Dust Census → Confetti Escape Velocity — the three genres this change names, as one path https://stellate.app/?genre=reggae&seed=4716&path=508.4799,263.9071,1829.2992&xdur=0.117

48506e7 https://github.com/aboard-io/stellate/commit/48506e7c767985d2f003bc49951ad42625873733