feat(guide): add exercise reset control [Codex]

[jderochervlk]

Guide learners need a way to discard a draft and return to an exercise's starting point without losing completed checkpoints.\n\nAdds an accessible Reset control in the editor header. It restores the active exercise's initial code, removes only that exercise's saved draft, and leaves completion progress intact. The Browser Mode coverage uses a completed exercise whose initial output does not automatically pass, so the retained-progress behavior is explicit.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-13T14:44:58.107416Z	997d668	PR opened

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[github-actions]

Guide Cloudflare deployment

⛅️ wrangler 4.114.0
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🌀 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...
🌀 Found 6 new or modified static assets to upload. Proceeding with upload...

• /assets/root-BcZ1ju43.js
• /assets/main-C-sv-CkO.css
• /assets/manifest-d5f3529b.js
• /index.html
• /__spa-fallback.html
• /assets/GuideHomeRoute-Dg29YbFf.js
  Uploaded 2 of 6 assets
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  Uploaded 6 of 6 assets
  ✨ Success! Uploaded 6 files (3 already uploaded) (1.55 sec)

Total Upload: 0.31 KiB / gzip: 0.22 KiB
Worker Startup Time: 0 ms
Uploaded guide (3.03 sec)
Worker Version ID: 413c90e7-bef4-46af-bc7d-2b4279f07975
Version Preview URL: https://413c90e7-guide.rescript.workers.dev
Version Preview Alias URL: https://feat-guide-exercise-reset-guide.rescript.workers.dev

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	guide	997d668	Commit Preview URL Branch Preview URL	Sep 13 2026, 02:42 PM

[github-actions]

Cloudflare deployment

Deployement ID: 0b251236-7119-4367-9faf-47235f03b7b9
Deployment Environment: preview

⛅️ wrangler 4.114.0
────────────────────
✨ Compiled Worker successfully
Uploading... (8289/8770)
Uploading... (8449/8770)
Uploading... (8609/8770)
Uploading... (8770/8770)
✨ Success! Uploaded 481 files (8289 already uploaded) (2.93 sec)

✨ Uploading _redirects
✨ Uploading Functions bundle
🌎 Deploying...
✨ Deployment complete! Take a peek over at https://0b251236.rescript-lang.pages.dev
✨ Deployment alias URL: https://feat-guide-exercise-reset.rescript-lang.pages.dev