docs(theme-studio): spec live color families for the palette

The palette panel becomes color families instead of a flat row of chips: a base color plus its tonal ramp, shown as a dark-to-light strip with a per-family symmetric step count (N gives base ±N). Families are live, so changing the count or the base regenerates the strip; regeneration is authoritative. fg and bg share a fixed ground strip, other standalone colors are singletons, and strips sort by hue across the panel with steps sorted by lightness within.

The spec keeps theme.json a flat palette (families derived from the ramp naming on import) and reuses the shipped ramp() and assignment re-point. Two decisions are left open for Craig: flat-vs-structured persistence, and whether the per-family count control should replace the standalone ramp panel. Six phases, each leaving the tree green; the v1 build it extends is cross-linked from the task.

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