[codex] add Cloudflare SSR for playground

[jderochervlk]

Context

This is the first slice of the playground SSR work. The docs app can keep prerendering static routes while letting /try run through Cloudflare Pages Functions.

Summary

• Enables React Router SSR for @rescript-lang/docs.
• Omits /try from React Router prerender output while keeping the existing stdlib prerender paths.
• Adds a Cloudflare Pages SSR entry/function path for /try and /try.data.
• Adds wrangler.toml for local Pages dev/deploy, including nodejs_compat and the Pages project name.
• Clears out before copying build/client so stale prerendered /try artifacts do not survive rebuilds.
• Formats the v12.3 API JSON files that were failing the existing full-repo format CI job.

Validation

• node .yarn/releases/yarn-4.13.0.cjs build:res
• node .yarn/releases/yarn-4.13.0.cjs workspace @rescript-lang/docs build:vite
• node_modules/.bin/oxfmt --check apps/docs/react-router.config.mjs apps/docs/app/entry.server.js apps/docs/server/react-router-handler.js apps/docs/functions/try.js apps/docs/functions/try.data.js
• yarn ci:format
• Wrangler Pages smoke test from fresh out: /, /try, and /try.data returned 200; /try.data included bundleBaseUrl and versions loader data.

No generated .jsx files are included in this PR.

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	guide	faf42a2	Commit Preview URL Branch Preview URL	May 21 2026, 04:07 PM

[github-actions]

Guide Cloudflare deployment

⛅️ wrangler 4.85.0
───────────────────
🌀 Building list of assets...
✨ Read 10 files from the assets directory /home/runner/work/rescript-lang.org/rescript-lang.org/apps/guide/out
🌀 Starting asset upload...
No updated asset files to upload. Proceeding with deployment...
Total Upload: 0.31 KiB / gzip: 0.22 KiB
Worker Startup Time: 0 ms
Uploaded guide (2.54 sec)
Worker Version ID: bfaec051-3f7b-4d5b-bdca-fde674e65ea6
Version Preview URL: https://bfaec051-guide.rescript.workers.dev
Version Preview Alias URL: https://vlk-enable-cloudflare-ssr-guide.rescript.workers.dev

To deploy this version to production traffic use the command wrangler versions deploy

Changes to non-versioned settings (config properties 'logpush' or 'tail_consumers') take effect after your next deployment using the command wrangler versions deploy

Changes to triggers (routes, custom domains, cron schedules, etc) must be applied with the command wrangler triggers deploy

[github-actions]

Cloudflare deployment

Deployement ID: 8f8ad45c-c177-4fa8-8858-e21b2e2fe795
Deployment Environment: preview

⛅️ wrangler 4.85.0
───────────────────
Uploading... (8401/8403)
Uploading... (8402/8403)
Uploading... (8403/8403)
✨ Success! Uploaded 2 files (8401 already uploaded) (1.63 sec)

✨ Uploading _redirects
✨ Uploading Functions bundle
🌎 Deploying...
✨ Deployment complete! Take a peek over at https://8f8ad45c.rescript-lang.pages.dev
✨ Deployment alias URL: https://vlk-enable-cloudflare-ssr.rescript-lang.pages.dev