feat: ci test

[dcrawbuck]

Note

Adds Bun smoke tests for Next and Cloudflare preview and runs them in the PR CI, including a helper to generate a test wrangler.jsonc.

• CI:
  • Update .github/workflows/docs-build-pr.yml to build via bun run build:cf, trigger on test/**, and run bun test.
• Testing:
  • Add server smoke tests test/next-start.test.ts and test/cf-preview.test.ts to verify /docs/home loads.
  • Include a readiness poller for endpoints.
• Scripts:
  • Add scripts/generate-test-wrangler.ts and script generate:test-wrangler to create a minimal wrangler.jsonc for tests.
  • Update scripts/download-references.ts to remove react-native repo test file after clone.
• Types:
  • Add @types/bun and test/tsconfig.json to include Bun types.

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