Guidelines CPT: Rename references from content guidelines to guidelines

[iamchughmayank]

What?

Follow-up to #77147 (CPT slug rename). See #76384.

Renames all internal references from "Content Guidelines" to "Guidelines" — class names, file names, directories, experiment flag, REST base, Redux store, CSS class prefix, meta keys, and route package name.

Why?

Before the 22.7 release, the public-facing name was simplified from "Content Guidelines" to just "Guidelines" — recognizing the feature extends beyond content to design guidelines, coding standards, and more (announcement
post).

In #77147, the CPT slug was aligned to wp_guideline. As noted in the review, the rest of the code still referenced the old "Content Guidelines" naming. This PR completes that
alignment.

How?

PHP:

• Classes: Gutenberg_Content_Guidelines_* → Gutenberg_Guidelines_*
• Files: class-gutenberg-content-guidelines-* → class-gutenberg-guidelines-*
• Directory: lib/experimental/content-guidelines/ → lib/experimental/guidelines/
• Functions: gutenberg_*_content_guidelines_* → gutenberg_*_guidelines_*

Identifiers:

• Experiment flag: gutenberg-content-guidelines → gutenberg-guidelines
• REST base: content-guidelines → guidelines
• Meta keys: _content_guideline_* → _guideline_*
• Redux store: core/content-guidelines → core/guidelines
• CSS prefix: .content-guidelines__ → .guidelines__
• Package: @wordpress/content-guidelines-route → @wordpress/guidelines-route

Unchanged: Admin page slug (guidelines-wp-admin), render function names that already use "guidelines" without "content".

Testing Instructions

Setup: npm run wp-env start

1. Navigate to Settings > Experiments, enable Guidelines, save.
2. Navigate to Settings > Guidelines.
3. Add text in Copy and Images fields, click Save.
4. Refresh — verify saved guidelines load correctly.
5. In browser devtools (Network tab), verify the fetch to /wp/v2/guidelines returns data while on the Guidelines admin page.
6. Run PHPUnit tests: vendor/bin/phpunit --filter Gutenberg_Guidelines — all 31 tests pass.
7. Run e2e tests: npm run test:e2e -- test/e2e/specs/admin/guidelines.spec.js — all 3 tests pass.

Testing Instructions for Keyboard

No special keyboard testing required.

Screenshots or screencast

No visual changes.

Use of AI Tools

Claude Opus used for planning the rename scope and executing the find-and-replace across the codebase.

[iamchughmayank]

Since this is experimental feature, perhaps, the Core back port may not be required. I understand that adding a specific label should skip the CI check failure of "Verify Core Backport"

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Co-authored-by: iamchughmayank <iamchughmayank@git.wordpress.org>
Co-authored-by: aagam-shah <aagam94@git.wordpress.org>
Co-authored-by: gziolo <gziolo@git.wordpress.org>
Co-authored-by: aswasif007 <aswasif007@git.wordpress.org>

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[gziolo]

Nice, thank you for working on the follow-up. The changes are straightforward, so it mostly needs some testing.

[aagam-shah]

Nice cleanup @iamchughmayank — the mechanical rename is thorough and consistent across PHP, JS, SCSS, and tests. A couple of concerns:

Incomplete JS/TS internal rename: The store STORE_NAME and CSS classes were renamed, but all JS/TS identifiers still say "ContentGuidelines" — fetchContentGuidelines, ContentGuidelinesState, coreContentGuidelinesStore, etc. Not blocking since these are private to the route package, but worth noting whether this is intentional or a follow-up.

Nit: package-lock.json includes an unrelated @babel/eslint-parser version hoist — lockfile regeneration noise.

[aswasif007]

Few observations:

• The rest_base rename from content-guidelines to guidelines and meta key prefix rename from content_guideline to guideline are breaking changes for any existing stored data. Posts saved with old meta keys won't be readable under the new keys without a migration. I supposed we already know that and fine with it, but still raising just in case.
• Four JSDoc/inline comments in the codebase still reference "content guidelines" instead of "guidelines":
  api.ts ~L113: * Opens file selector, reads the selected file and imports the content guidelines.
  api.ts ~L114: * @param file Content Guidelines JSON file
  api.ts ~L177: * Exports the content guidelines as a JSON file.
  stage.tsx ~L66: // Populate the store with the content guidelines.