Agents Manager: add standalone AI chat button to the admin bar

[wellyshen]

Part of AI-995

Proposed changes

• Add a standalone "Ask AI" button to the wp-admin bar (agents-manager-ai-chat node under top-secondary), separate from the Help Center menu.
• Registered only in the unified experience (agents_manager_use_unified_experience), for connected, non-Gutenberg, non-CIAB variants.
• Add PHPUnit coverage for the gating (the button is registered only when the unified experience is enabled, and not otherwise).

Related product discussion/links

• AI-995

Does this pull request change what data or activity we track or use?

No.

Testing instructions

• This change only renders the admin-bar button element; its styling and click behavior (reopening the chat) come from the Calypso side. Refer to the testing instructions in Agents Manager: add standalone AI chat button to the masterbar and admin bar wp-calypso#111434.

[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/agents-manager-ai-chat-button branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/agents-manager-ai-chat-button

bin/jetpack-downloader test jetpack-mu-wpcom-plugin add/agents-manager-ai-chat-button

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

[github-actions]

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[Copilot]

Pull request overview

Adds a standalone “Ask AI” admin-bar entry for Agents Manager so users in the unified experience can open a new chat directly, separate from the Help Center dropdown.

Changes:

• Register a new agents-manager-ai-chat node under top-secondary when agents_manager_use_unified_experience is enabled (and only for connected, non-Gutenberg, non-CIAB contexts).
• Add a new changelog entry documenting the new admin-bar button.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
projects/packages/agents-manager/src/class-agents-manager.php	Adds an admin_bar_menu registration for a new “Ask AI” admin-bar item (standalone new-chat entry).
projects/packages/agents-manager/changelog/add-agents-manager-ai-chat-button	Changelog entry for the new standalone AI chat admin-bar button.

[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/agents-manager/src/class-agents-manager.php	240/366 (65.57%)	-1.00%	7 💔

Full summary · PHP report · JS report

_{Coverage check overridden by I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage. .}

[johngodley]

Tested as part of Automattic/wp-calypso#111434 and everything works as described. Code looks good