* Flip to the 128-leaf theme contract and defineTheme-only authoring Reduce the emitted contract 152->128: feedback intents (info/success/ warning) collapse to a static subtle+border+text kit; drop surface.resting, surfaceDisabled, borderDisabled, and the unused motion tail; rename textDisabled->text.disabled (CSS-var-stable); add color.scrim. Emit color.scrim from the theme and replace the hardcoded combobox tray scrim with vars.color.scrim. Make defineTheme the sole public authoring API: drop buildTheme and the raw foundation types from the package entry (kept internal for the build pipeline), rewrite Tactile/Paper as defineTheme inputs, and route build-themes/themes through defineTheme. validateContrast drops removed-token checks and adds text.primary x neutral.surface.subtle*. Retained token values are byte-identical (zero visual drift; goldens unchanged). Breaking major. Part of #226 / #228. * Update docs for the 128-leaf contract and defineTheme authoring Rewrite the theming and overview docs plus STYLING.md to document defineTheme as the sole public authoring API and the reduced 128-leaf token contract (static feedback intents, text.disabled, scrim; removed surface.resting, the disabled surface/border tokens, and the unused motion tail). Repoint live docs examples/samples off removed tokens. Part of #226 / #228.