docs: spec Phase Γ — the instrument's control surface
Two-row deck reflow (sound/contour), double-height MASTER with limiter and meter, PITCH/RATE deck, unit-driven knob law, contour-trace fix, and a re-approached loop/crossfade UX. Folds rulings Γ-F1..Γ-F5; opens Γ-F6.
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