MLXChatExample: register Gemma 4 (E2B / E4B) VLMs#473
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Adds the two smaller `gemma4` checkpoints already published in `VLMRegistry` (`gemma4_E2B_it_4bit`, `gemma4_E4B_it_4bit`) to the chat app's `availableModels`, so they appear alongside the existing qwen / smol VLMs in the model picker on macOS and iOS. The 31B and 26BA4B variants are intentionally left out — they are too large to be practical on the supported iOS devices.
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Summary
Registers the two smaller Gemma 4 VLM checkpoints already published in `VLMRegistry` (`gemma4_E2B_it_4bit`, `gemma4_E4B_it_4bit`) in MLXChatExample's `availableModels`, so they appear alongside the existing qwen / smol VLMs in the model picker on macOS and iOS. The 31B and 26BA4B variants are intentionally left out — too large to be practical on supported iOS devices.
Depends on (or coexists with) ml-explore/mlx-swift-lm#256 for video support; image and text input work today against any Gemma 4 mlx-swift-lm release that ships the model registration (already merged via #180 / #185).
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