docs(theme-studio): fold the color-families review and pivot to hex grouping

Resolved both open decisions per Craig: theme.json stays flat, and the standalone ramp panel goes away in favor of the per-strip control. The bigger change is the grouping mechanism: families are now derived from OKLCH hue off the hex, never from a name convention, so renaming a color to anything never moves it between strips.

That pivot designs out the Codex review's two hardest blockers. There's no step-name grammar and no import inference, because grouping isn't name-based. And the palette stays a flat, individually-editable list rather than transferring ownership to family objects, so per-chip rename/remove/edit keep working and there's no ownership contract to invent. Families are a display view over the existing palette.

The rest of the review is folded as written, adapted to the flat model: the ground strip is synthesized from the bg/fg assignments (pinned, editable, de-duped by hex), removed-step references degrade to a visible "(gone)" rather than a silent jump, n=0 is handled without ramp(), and the neutral (0.02) and hue-gap (25) thresholds and sort tie-breakers are pinned. Review file consumed and deleted; dispositions and a responder entry are in the spec.

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