Create foundational Pipeline Authoring agent

Taking away the point from Visual Canvas discussion about using Duo to generate required CI Config from project context -

Engineering to figure out: Can we add a new default agent, so that users don’t have to enable it manually via the AI Catalog? If so, can we then initiate a Duo session with that agent already pre-selected?

Along with this, we need to work on research task on figuring out how to add default agent/custom agent if we have to.

Goal:

1. Share research and steps about creating custom agents.
2. Figuring out if we can initiate Duo session with default agent pre-selected for Pipeline creation.
3. If we have the ability to create custom/default agent specifically for Pipeline in AI Catalog.