feat(#3996): reject incompatible image-output gateway requests - #4020
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Reject tools, built-in tools, and structured output before dispatch whenever image output resolves enabled on Google gateway, direct Gemini API, or Vertex AI. The guard uses the same binding capability policy as request construction: explicit false, then explicit true, then exact models.dev Modalities.Output=image for an omitted image flag; unknown or unavailable metadata stays off. It never guesses from model names. Return fixed safe incompatibility classes, enrich custom-tool errors from models.dev tool_call metadata when available, and keep provider text, prompts, names, and schemas out of user-visible guard errors.
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What
Rejects incompatible Gemini image-output gateway requests before dispatch, with shared diagnostics and integration coverage across runtime and TUI paths.
Why
Provides a deterministic, actionable failure instead of sending unsupported response modalities to a gateway.
Validation
task test; Gemini guard and runtime/TUI integration tests.Test instructions
Run:
task testRequest image output through a Gemini gateway using an incompatible model, then using a compatible model. Expected: the incompatible request is rejected before dispatch with the categorized diagnostic, while the compatible request proceeds normally.