#2 Semantic leading/tracking config-driven: the per-role `--leading-{role}`
(ui/prose/text/heading/display) + `--tracking-{role}` (badge/label/ui/prose/
heading/display) tokens were hardcoded in render-css; moved to
`typography.semanticLeading` / `semanticTracking` (STATIC_TYPOGRAPHY), emitted
config-driven + validated, so a theme can retune them. Byte-identical output
(generated/base.css unchanged — same values, same order).
#3 Font preloads: `collectFontPreloads(typography)` (pure) + `eidos.fontPreloads()`
surface `<link rel=preload>` descriptors for families flagged `preload: true`
(the engine emits CSS, not head markup), for the app `<svelte:head>`. Inert
until a theme opts in.
Docs: TYPOGRAPHY_ENGINE_RFC fases marked closed + Fase 4 (the two-zone scale is
intentional — documented, not rewired); THEMING §10 — applyColorScheme +
applyTypeScale system builders.
`npm run check` 0 errors; new font-preload tests + config/generated tests pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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