Add workflow infrastructure — ESLint, Prettier, Husky, Vitest, 7 new skills

Phase 1: Session log archived (1096→91 lines), D031 token access convention
Phase 2: ESLint v9 + Prettier + jsx-a11y, initial config and lint fixes
Phase 3: 7 new skills (polish, harden, normalize, clarify, typeset, quieter, adapt)
         + Vercel reference docs, updated audit/review-component refs
Phase 4: Husky + lint-staged pre-commit hooks, preflight updated to 8 checks
Phase 5: Vitest + Testing Library + /write-tests skill

- Badge.tsx colour maps unified to CSS variables (D031)
- 5 empty interface→type alias fixes (Switch, Radio, Divider, IconButton, Link)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -73,7 +73,7 @@ This project uses structured markdown files for cross-session memory.
 - `docs/memory/decisions-log.md` — All design decisions with rationale
 - `docs/memory/component-registry.md` — Status of every component (planned/in-progress/done)
 - `docs/memory/token-registry.md` — All tokens with their current values and usage notes
-- `docs/memory/session-log.md` — What was done in previous sessions, what's next
+- `docs/memory/session-log.md` — Recent sessions (last 2-3); older sessions in `docs/memory/archive/`
 
 **After completing work, update:**
 - The relevant memory files with what changed