J/docs

[jdchawla29]

Add docs for GeminiCUAAgent, highlight differentiation. Also fix gateway model resolution to use the api endpoint which correctly resolves the agent_type for specialized models.

---

Note

Updates model resolution to align with the HUD Platform API and expands docs for Gemini CUA.

• Switches gateway lookup to HUD API (/models/), parsing models with model_name, sdk_agent_type, and provider defaults; resolve_cls now maps via sdk_agent_type or provider.default_sdk_agent_type and create_agent passes provider name to build_gateway_client
• Refactors tests to new schema and adds coverage for Gemini, Operator, OpenAI-compatible, and provider override behaviors
• Documentation: standardizes config param from checkpoint_name → model across agents; adds GeminiCUAAgent section (config, predefined functions, example); updates hud eval to include gemini_cua; adds AgentType.GEMINI_CUA to types; minor Gemini agent description tweaks

^{Written by Cursor Bugbot for commit 318aea9. This will update automatically on new commits. Configure here.}

Fixes HUD-648

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