Plans: register WP Abilities API (current plan, plan catalog, purchase URL)

[enejb]

Proposed changes

• Adds Automattic\Jetpack\Plans\Abilities\Plans_Abilities, a Registrar-extending class under projects/packages/plans/src/abilities/class-plans-abilities.php.
• Registers three read-only abilities on WP 6.9+ under the jetpack-plans/* namespace:
  • jetpack-plans/get-current-plan — zero-arg read of the site's active Jetpack plan (slug, name, expiry, features, product_id, billing period, supports map).
  • jetpack-plans/list-plans — Jetpack plan catalog with optional category filter (security | all; performance documented as a synonym for all since no separate performance grouping exists in the catalog today).
  • jetpack-plans/get-purchase-url — mint a checkout URL for a given plan slug. URL-mint only, no state change.
• Cross-consumer wiring: registration is bootstrapped from projects/packages/plans/actions.php (added to composer.json autoload.files) using the canonical guarded pattern. The plans package is depended on by Jetpack + every standalone plugin (boost, social, search, protect, backup, …), so the abilities surface in every consumer.
• Adds automattic/jetpack-wp-abilities as a runtime dependency.
• Gated by the top-level jetpack_wp_abilities_enabled filter (default false).

Testing instructions

1. composer install from projects/packages/plans/.
2. composer phpunit -- --filter Plans_Abilities_Test.
3. On a connected site with the gate filter enabled, curl /wp-json/wp-abilities/v1/abilities | jq '.[] | select(.name | startswith("jetpack-plans/")) | .name' and confirm the three slugs.

Plan reference

Abilities rollout plan — §4.2 Plans package.

[github-actions]

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack or WordPress.com Site Helper), and enable the add/ship-plans-abilities branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/ship-plans-abilities

bin/jetpack-downloader test jetpack-mu-wpcom-plugin add/ship-plans-abilities

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[jp-launch-control]

Code Coverage Summary

1 file is newly checked for coverage.

File	Coverage
projects/packages/plans/src/abilities/class-plans-abilities.php	253/279 (90.68%) 💚

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