KAi: Multi-agent

## Definition of done
- https://developer.konghq.com/konnect-platform/kai/#how-kai-works Explain the different agents that are available, how the agents are picked by the supervisor, etc.
- Update diagram on the landing page with the multi-agent architecture

## Information
DRP: Sumeetha S.
Aha: https://konghq.aha.io/epics/KAI-E-36

## Due date (optional)

targeting March, exact date TBD

## Size
S

Start by reading the KAi “How KAI works” page linked in the issue and inspect the landing-page diagram. Document the available agents and how the supervisor selects them, then update the diagram to show the multi-agent architecture; done means both the explanation and diagram reflect that architecture.

Written by the indexing model from the issue text.