This skill should be used when the user says "sketch", "arness code sketch", "preview this", "show me what this looks like", "UI preview", "sketch the feature", "visual preview", "sketch this page", "what will this look like", "mock this up", "prototype this UI", "preview the design", "sketch the UI", "preview this command", "show me what the output looks like", "sketch the TUI", "what will the CLI look like", "mock up the terminal output", or wants to see a working interface preview of a feature in the context of their existing application before committing to full implementation. Creates real, runnable artifacts using the project's actual framework and conventions, rendered in a dedicated sketch namespace.