### CHANGES
- Unify assistant and user message formatting logic.
- Use `formatMultiContentMessage` for assistant role messages.
- Improve dryrun support for multi-part message content.
### CHANGES
- Handle multi-content messages for the user role.
- Display image URLs from user messages in output.
- Update both `Send` and `SendStream` methods.
- Retain existing behavior for simple text messages.
## CHANGES
- Add NeedsRawMode to Vendor interface
- Implement NeedsRawMode in all AI clients
- Return false for all implementations
- Support model-specific raw mode detection
- Enable future raw mode requirements
