refactor: Update AgentType enum to use 'Credo' instead of 'AFJ'

### 📦 Refactor: Update AgentType enum to use 'Credo' instead of 'AFJ'

#### Description
There is a lingering TODO in the `AgentType` enum defined in `libs/enum/src/enum.ts`:

```ts
// TODO: Change 'AFJ' to 'Credo' once updated across services
AFJ = 'AFJ',
