feat: register abilities with the Abilities API

[selul]

Registers five Visualizer abilities with the WordPress Abilities API (no-op below WP 6.9).

• visualizer/list-charts — edit_posts; users without edit_others_posts only see their own charts
• visualizer/get-chart — edit_posts + Visualizer_Module::can_edit_chart()
• visualizer/upsert-chart — edit_posts to create, can_edit_chart() to update; chart types gated by plan
• visualizer/set-data-source — edit_posts + can_edit_chart(); db_query also needs administrator + super admin; sources and refresh intervals gated by plan
• visualizer/refresh-chart-data — edit_posts + can_edit_chart()
• Opts in to the SDK AI Connect module through the visualizer_ai_connect_metadata filter (no-op until the SDK release that ships it)
• Pro-required errors include the upgrade link.

Testing: php -l, PHPCS and PHPStan pass; all abilities exercised through WP_Ability::execute() on a local WP 7.1 install (Free, and Pro plan simulated via the plan filters).

🤖 Generated with Claude Code

[pirate-bot]

💂‍♂️ PR Error! No Linked Issue found. Please link an issue or mention it in the body using #<issue_id>

[pirate-bot]

Plugin build for 4d996ef is ready 🛎️!

• Download build