feat: docs site, llms.txt, and v0.3.0

[codesoda]

Summary

• Starlight docs site (docs/) — 20 content pages: landing, getting-started, 8 guides, 5 reference, 5 examples
• LLM docs — /llms.txt root + 15 sub-pages at /llms/*.txt for agent consumption
• GitHub Actions workflow (.github/workflows/docs.yml) — deploys to Cloudflare Pages on docs/** changes to main
• CLI help links — bugatti --help → bugatti.dev/llms.txt, bugatti test --help → bugatti.dev/llms/cli-reference.txt
• Version bump — 0.2.0 → 0.3.0

Deploy requirements

• Cloudflare Pages project bugatti-dev (created on first deploy)
• GitHub secrets: CLOUDFLARE_API_TOKEN, CLOUDFLARE_ACCOUNT_ID (already set)
• Domain bugatti.dev pointed at Cloudflare Pages (configured in CF dashboard after first deploy)

Test plan

• cd docs && pnpm build — 21 pages built, search index, sitemap
• cargo build — compiles with updated cli.rs
• cargo test — all tests pass
• bugatti --help shows Docs: https://bugatti.dev/llms.txt
• bugatti test --help shows Docs: https://bugatti.dev/llms/cli-reference.txt
• llms.txt and all sub-pages present in docs/dist/
• Merge to main triggers docs deploy workflow
• bugatti.dev resolves and serves docs