The 8th book channel (forma) — the one no web design system has elevated. Fase 1
lays the foundation: corner continuity + perceptual families as portable tokens.
- ShapePrimitiveSet (config-driven): `smoothing` (superellipse exponent, 1=arc ->
2=squircle) + `families` map. STATIC_SHAPE ships rounded/continuous/cut/scoop.
- Emission: `--shape-smoothing` token + `[data-shape=`{family}`]` rules setting
`corner-shape` (round / superellipse(var(--shape-smoothing)) / bevel / scoop).
Opt-in: magnitude stays in `--radius-*` (untouched), so corners degrade to the
plain border-radius arc where `corner-shape` is unsupported (progressive, like
the wide-gamut oklch of color). var() works inside superellipse() (Chrome 146).
- Validation (validateShapePrimitives) + 2 tests + regen.
Why it matters: the whole web field (Tailwind/shadcn/Chakra/Mantine/Ant/Radix
Themes/Carbon/Fluent/Spectrum/Polaris/Primer) is "radius scale + circular arc +
static". Continuity exists only in Apple (platform-locked); none on the web ships
squircle as a token. This is the first.
Verified: npm run check 0 errors; eidos config+generated 54/54. data-shape applies
in the live runtime (continuous->squircle, cut->bevel, scoop->scoop).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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