v0.3 Phase 1: Tactile Quietware tokens

Foundation for the v0.3 Tactile Quietware release. Tokens only. No
component refactors, no layout changes, no behavioural shifts. The new
palette and typography activate only when html[data-design="quietware"]
is set; the runtime v0.2 surface is unaffected without the attribute.

What landed.

  - Three-mode palette (light, dark, high-contrast) at
    src/design-system/v0.3-quietware-tokens.css. Strict 90deg square
    colour harmony pegged at cobalt blue #0047AB. Hues: 215 / 305 / 35
    / 125. Saturation locked at 100%. Lightness adjusted per role for
    WCAG AA 4.5:1 on the relevant background; computed values
    documented in the plan doc.

  - V4 font stack self-hosted as WOFF2:
        Work Sans (variable, roman + italic) for body, UI, controls.
        Young Serif for brand moments only.
        JetBrains Mono stays via existing src/fonts/jetbrains-mono.woff2.

  - Import wired in src/app.css directly after the tailwind import.
    The new tokens are inert until data-design="quietware" is set on
    <html>.

  - Reduced-motion override scoped to quietware so prefers-reduced-motion
    actually bites inside the new design system from day one.

  - Plan doc at docs/release/v0.3-tactile-quietware.md with the full
    seven-phase plan (Phase 1 logged), four high-priority persona test
    gates (Pawel, Simone, Chris, Ron), and the Phase 0 gov.uk DfE
    accessibility tools checklist.

Activation paths.

  - Manual now: dev tools, set <html data-design="quietware">.
  - Phase 2 will wire VITE_LUMOTIA_QUIETWARE=1 through +layout.svelte.

Verified.

  - npm run check produced 26 errors but all 26 are pre-existing in
    files this PR does not touch (LumotiaTooltip.svelte missing
    bits-ui import; tests/e2e/smoke.spec.ts missing playwright types).
    Tracked separately, not blocking v0.3 Phase 1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

This commit is contained in: