Image to image with gemini-2.0-flash-preview-image-generation

[tpaulshippy]

What this does

Enable image-to-image generation with gemini-2.0-flash-preview-image-generation

Was not sure how exactly to handle image outputs in chats so I just threw an images array on the Message model for now. Very open to better ideas.

Type of change

• New feature

Scope check

• I read the Contributing Guide
• This aligns with RubyLLM's focus on LLM communication
• This isn't application-specific logic that belongs in user code
• This benefits most users, not just my specific use case

Quality check

• I ran overcommit --install and all hooks pass
• I tested my changes thoroughly
• I updated documentation if needed
• I didn't modify auto-generated files manually (models.json, aliases.json)

API changes

• New public methods/classes

Related issues

Screenshots

Here's what the test did.

Input
put this in a ring

Output

[tpaulshippy]

Thinking I need to move to content with attachments so the image gets sent properly on the next call.