Abilities API: Reuse JSON Schema client preparation

[gziolo]

Trac ticket: https://core.trac.wordpress.org/ticket/64955

What

• Introduces wp_prepare_json_schema_for_client() for preparing JSON Schemas that are exposed to clients.
• Reuses the helper for Abilities REST responses and for WP AI Client ability input schemas used as function declaration parameters.
• Moves detailed schema preparation coverage into the shared JSON Schema tests while leaving REST and AI Client tests focused on integration wiring.

Why

Ability schemas can include WordPress-internal schema conveniences that are accepted by server-side REST validation but are not portable JSON Schema draft-04 forms. Preparing them through a shared helper keeps REST responses, frontend consumers, and AI tool declarations aligned.

Testing

• vendor/bin/phpcs --standard=phpcs.xml.dist src/wp-includes/json-schema.php src/wp-includes/rest-api/endpoints/class-wp-rest-abilities-v1-list-controller.php src/wp-includes/ai-client/class-wp-ai-client-prompt-builder.php tests/phpunit/tests/json-schema.php tests/phpunit/tests/ai-client/wpAiClientPromptBuilder.php tests/phpunit/tests/rest-api/wpRestAbilitiesV1ListController.php
• php -l src/wp-includes/json-schema.php
• git diff --check
• npm run test:php -- --filter 'Tests_JSON_Schema|Tests_AI_Client_PromptBuilder|Tests_REST_API_WpRestAbilitiesV1ListController'

[github-actions]

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[github-actions]

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[github-actions]

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