Simplify generated AGENTS.md to use live docs

[acoyfellow]

Tracks DEVX-2642 internally.

Summary

Create Cloudflare currently generates an AGENTS.md with a fixed list of commands, products, limits, error guidance, and best-practice links. That content can become stale as Cloudflare products and documentation change.

This change replaces the fixed inventory with a small retrieval instruction:

# Cloudflare Workers

Always retrieve current Cloudflare documentation before writing or changing Cloudflare code. Do not rely on training data for APIs, configuration, limits, or best practices.

Start at https://developers.cloudflare.com/llms.txt. Choose the relevant product's `llms.txt`, then retrieve only the specific Markdown pages needed for the task.

The root documentation index remains stable while product-specific guidance can change in the documentation without requiring a Create Cloudflare release. Asking agents to retrieve only the pages needed for the task also keeps generated context small.

This deliberately differs from #14775, which expands the generated file with Local Explorer endpoints. The intent here is to keep product instructions in the live documentation and keep the generated file as the durable entry point to that documentation.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this changes generated agent guidance and does not change user-facing product behavior

Validation:

• pnpm run test:ci in packages/create-cloudflare: 261 tests passed
• pnpm run check:type in packages/create-cloudflare
• pnpm run build in packages/create-cloudflare
• oxlint --deny-warnings --type-aware for the changed TypeScript files
• oxfmt --check for the changed files

---

[changeset-bot]

🦋 Changeset detected

Latest commit: 9e36881

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
create-cloudflare	Patch

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[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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@cloudflare/autoconfig

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commit: 9e36881

[dario-piotrowicz]

Approved with one small suggestion 🙂

[workers-devprod]

Codeowners reviews satisfied