v0.5: Penpot é a implementação — monorepo, tokens DTCG, portal de docs, plugin

- Monorepo pnpm (packages/, apps/)
- packages/tokens: W3C DTCG canônico + build vanilla → CSS/JS/TS/Penpot JSON (52 tokens)
- apps/docs: portal zeroheight-style substitui showcase (overview, foundations, components, guidelines, resources, changelog)
- packages/penpot-plugin: scaffold v1 (push tokens DTCG → Penpot library)
- penpot/: rpc.js + library.config.json + scripts (export-snapshot, publish-library, verify-drift)
- .github/workflows/: tokens-build, penpot-sync, penpot-snapshot, release, docs-deploy
- .cloudflare/pages.toml: docs + plugin hosting config
- README + ROADMAP reescritos
- Deletado: showcase legado (src/, index.html, vite.config.js), docs/manual.md, penpot/library.json antigo, public/raw

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