Design a change — create a change container (if needed) and generate spec artifacts. <decision boundary Use for: - Creating a new Beat change and generating spec artifacts (proposal, gherkin, design.md) - Resuming artifact generation for an existing change that has pending spec artifacts - Choosing which spec artifacts to include (presets: Full, Standard, Minimal, Technical, Custom) NOT for: - Breaking down tasks or creating execution plans (use ) - Exploring ideas or thinking through a problem before committing (use ) - Implementing code (use ) - Reviewing or verifying implementation (use )…