[SandObserver]

Summary

• Add a Pull requests section to CONTRIBUTING.md covering branch naming, title format, body expectations and label choice.
• Record the four branch types already in use, docs, fix, feat and chore, and the Type: short description title format the merged pull requests follow.
• List this repository's eleven applicable labels with what each is for, so the choice is not made against the application repository's different list.
• State that this repository has no CHANGELOG.md and nothing here is versioned.

Testing
All green: npm run build and npm run check both pass. Documentation only, no page output changes.

Checklist

• npm run build and npm run check both pass.
• Product UI is shown by running or capturing it, never recreated in CSS.
• Any new preview or screenshot carries no private hostnames or real data.
• Visual changes verified in both colour schemes and both docs themes.
• Links to the app repo still resolve.

[cloudflare-workers-and-pages]

Deploying stackyard-docs with    Cloudflare Pages

Latest commit:	cdc57ed
Status:	✅  Deploy successful!
Preview URL:	https://5f92fb7f.stackyard-docs.pages.dev
Branch Preview URL:	https://docs-repo-conventions.stackyard-docs.pages.dev

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