chore: add cookbook

[DmitryAnansky]

What/Why/How?

Added cookbook to the redocly/cli monorepo.

Reference

Redocly/redocly-cli-cookbook#55

Testing

Screenshots (optional)

Check yourself

• This PR follows the contributing guide
• All new/updated code is covered by tests
• Core code changed? - Tested with other Redocly products (internal contributions only)
• New package installed? - Tested in different environments (browser/node)
• Documentation update has been considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

---

Note

Low Risk
Adds documentation and example configs only; cookbook is explicitly outside the CLI build and test suite, with no runtime package changes.

Overview
Adds a new cookbook/ tree — a community catalog of copy-pasteable rulesets, configurable rules, custom plugins (rules and decorators), and misc utilities, each with READMEs and sample redocly.yaml / OpenAPI where relevant.

Contributor and CI updates: CONTRIBUTING.md documents how to add cookbook entries (no changeset; use no changeset needed). Docs workflows lint cookbook/**/*.md with markdownlint and run link checks on ./cookbook in addition to ./docs.

^{Reviewed by Cursor Bugbot for commit 09607e4. Bugbot is set up for automated code reviews on this repo. Configure here.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 09607e4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	71.97% (🎯 69%)	8676 / 12055
🔵	Statements	71.65% (🎯 69%)	9027 / 12598
🔵	Functions	76.63% (🎯 73%)	1719 / 2243
🔵	Branches	63.48% (🎯 61%)	5844 / 9205

File Coverage

No changed files found.

Generated in workflow #10825 for commit 09607e4 by the Vitest Coverage Report Action

[github-actions]

Performance Benchmark (Lower is Faster)

CLI Version	Bundle	Lint	Check Config
cli-latest	▓ 1.00x ± 0.01	▓ 1.00x ± 0	▓ 1.00x (Fastest)
cli-next	▓ 1.00x (Fastest)	▓ 1.00x (Fastest)	▓ 1.00x ± 0.02

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 3 potential issues.

There are 4 total unresolved issues (including 1 from previous review).

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 7e0596d. Configure here.}