Implement an agent system similarly to the original Microsoft Agent

A quick reminder that Clippy isn't the only Office Assistant. There's Rover (from Windows XP's explorer.exe), Bonzi (known for being featured on a spyware program), Dot (red bouncing ball), and more.

I suggest you to look at [clippy.js](https://github.com/clippyjs/clippy.js) for reference of the agent system and these pages on The Spriters Resource:

* https://www.spriters-resource.com/pc_computer/bonzibuddy/sheet/61851/
* https://www.spriters-resource.com/pc_computer/bonzibuddy/sheet/93782/

Start by reviewing the linked clippy.js project and the referenced Spriters Resource sheets for the proposed agent system and character assets. Done would require a defined, working system supporting additional assistants such as Rover, Bonzi, or Dot, but this issue names no project files, tests, or acceptance criteria.

Written by the indexing model from the issue text.