fix (ai): mcp-client properly responds to ping requests.

[rado0x54]

Background

According to the Model Context Protocol specification, clients should respond to ping requests from the server to maintain the connection. When a server sends a ping request, the client should send a ping response. (See Specification)

Summary

Added proper message handling for message.method === 'ping'.

Verification

I've setup the fixed mcp client against an mcp server that implements (and requires) server-side pings to be replied to.

hub:dev: Pinging session f8d2a102-7953-453a-af61-fa7f5320cd4e...
hub:dev: Handling message for session f8d2a102-7953-453a-af61-fa7f5320cd4e
hub:dev: Ping successful for session f8d2a102-7953-453a-af61-fa7f5320cd4e

Tasks

• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• Formatting issues have been fixed (run pnpm prettier-fix in the project root)

Related Issues

Fixes #6282