video update

fix vision

update agent

fix nvidia

feat: Reorder `smart_invoke` fallback to OpenRouter-Gemini-Groq, add adaptive Gemini model selection, and persist API tier for subsequent calls.

increase models

feat: Upgrade Gemini model, reorder model fallback tiers, enhance error handling, and add image tool forcing with a new test.

refactor: Remove explicit `google_api_key` assignment for Gemini model, relying on automatic environment variable pickup.