Agent Skills: setup

This skill should be used when the user asks to "set up gemskills", "configure gemskills", "choose default image/video provider", "use OpenAI for images", "use xAI/Grok for video", "switch image model", "which providers are available", "gemskills onboarding", or wants to set or inspect which AI provider (Gemini, OpenAI gpt-image-2, xAI Grok Imagine) is used by default for image, video, and edit generation. Detects available API keys and persists provider defaults.