cmux Artifact Use this skill when the user asks for an HTML artifact, walkthrough, evidence page, demo page, artifact preview, or a workspace layout that helps them dogfood, verify, or understand a change. The goal is a durable, inspectable artifact plus non-disruptive cmux workspace tabs for the important evidence. Prerequisites - The caller cmux workspace is the default target, not a requirement. Read the skill when opening panes, tabs, browsers, logs, screenshots, videos, or generated documents. - Default to the caller workspace's right helper pane for task-tied evidence (dogfood proof, fa…