The space scale was the one structural primitive without a builder — density and
scaling were already strong, but the base space scale stayed flat / static / arbitrary.
buildSpaceScale (pure) + ActiveEidos.applySpacing/clearSpacing regenerate the
--space-{key} ladder from one base unit, optionally FLUID (growth > 1 -> each step
clamp()s with the viewport, reusing the type scale fluidClamp), PRESERVING the
density x scaling composition (calc(value * --density-space-scale * --scaling)).
Opt-in over the authored STATIC_SPACE, same posture as applyTypeScale. Completes the
runtime-builder quintet (color/type/depth/shape/space).
Thesis (STRUCTURE_ENGINE_RFC): space is rhythm, not a flat px lookup table — modular,
fluid, composed with density x scaling from a seed. Structural = state-only (no
two-moment; honest).
Verified: check 0 errors; eidos config 58/58 (incl. modular + fluid space tests).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
