CodeMender updates: Model support

CodeMender updates: Model support

This release introduces updates to CodeMender:

• Gemini 3 Flash removal: Gemini 3 Flash (gemini-3-flash-preview) is no longer supported as a model backend for CodeMender. CodeMender supports Gemini 3.5 Flash (default) and Gemini 3.1 Pro Preview.

For more information, see Specifying the model.