This will allow users on .com to select a custom agent when starting a
new chat.

Agents may be passed in, they only require a `text` property.

feat: add agent dropdown to duo chat header

See merge request !261

# [10.20.0](v10.19.0...v10.20.0) (2025-09-05)

### Features

* add agent dropdown to duo chat header ([a74a34c1](a74a34c1))