Foundations: repo scaffolding, tooling & CI #3

Set up the monorepo and the delivery pipeline (REQUIREMENTS §2, §4, §8, §17, §20).

• pnpm workspace: packages/onu, examples, docs, figma
• @javaabu/onu package: ESM only, sideEffects for CSS, subpath exports (§2 R2.5), optional peer deps (R2.6), React 18.3/19 + Tailwind 4 peers
• TypeScript strict; Vite library build with preserved modules + .d.ts; "use client" banners
• ESLint (incl. a rule banning physical left/right Tailwind utilities, R11.2), Prettier
• Vitest + RTL + user-event + jsdom + vitest-axe; coverage thresholds (90/85, Thaana engine 100%)
• GitHub Actions: ci.yml (lint, format, typecheck, test+coverage, build package/examples/docs, size check, licence check, audit), e2e.yml, release.yml (Changesets + npm provenance)
• Codecov upload; README badges (tests, coverage, npm, licence)
• Changesets, size-limit budgets, Renovate config
• DEPENDENCIES.md, CONTRIBUTING.md, LICENSE.md, CHANGELOG.md