Completes the forced-colors a11y work. Users who request more contrast (macOS
"Increase contrast", Windows, etc.) now get strengthened neutral chrome: borders
bumped to neutral 7/8/9 (subtle/default/strong) and de-emphasized text to 12/11
(secondary/muted). Solid fills + primary text are already high-contrast, so they stay.
renderPrefersContrastBlock emits a @media (prefers-contrast: more) block using
`:root:root` (specificity 0,2,0) so it wins over the theme's :root regardless of
stylesheet order. Values reference --primitive-neutral-* (resolve from the cascade; a
theme omitting them just no-ops the declaration — graceful). Strictly additive (gated
by the media query) and strictly STRONGER, so it can't regress the default look.
Also marks audit P3-6 resolved: dispose() already routes documentElement access via
dom (#lastAttrs.target + dom.apply), no direct document access remains.
- generated/base.css regenerated. test: renderStaticCss emits the prefers-contrast
block. docs: THEMING §28 + audit P3-2/P3-6.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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