Abilities API: Register Resources

[n7studios]

Summary

Adds four read-only MCP abilities that list the Kit resources cached from the connected Kit account, so an MCP client can map a user-supplied resource name (e.g. "the Auto Confirm Form") to the numeric ID required by every other Kit ability.

Without these, AI can call the existing MCP tools e.g. kit/form-update, but the model but has no way to discover which Form / Tag / Landing Page / Product IDs are valid, meaning prompts like "replace the Page Form on /pricing with the Auto Opt In Form" either fail or hallucinate IDs.

Ability	Description	Backed by	Per-item shape
kit/forms-list	Lists every Kit Form (id, name, format).	ConvertKit_Resource_Forms	{ id, name, format }
kit/tags-list	Lists every Kit Tag (id, name). Prefix with tag_ for restrict-content fields.	ConvertKit_Resource_Tags	{ id, name }
kit/landing-pages-list	Lists every Kit Landing Page (id, name). Applies only to WordPress Pages.	ConvertKit_Resource_Landing_Pages	{ id, name }
kit/products-list	Lists every Kit Product (id, name). Prefix with product_ for restrict-content fields.	ConvertKit_Resource_Products	{ id, name }

Testing

• MCPResourceTest: Test that each resource is registered as an ability and loads the correct data.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

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