Use when you need to take a `*.plan.md` file and turn it into OpenSpec change artifacts by validating OpenSpec installation, initializing or reusing an OpenSpec project, and creating or updating a change proposal/spec/tasks flow. Includes a concrete workflow based on `examples/requirements-examples/problem1/requirements/openspec`. This should trigger for requests such as Convert `*.plan.md` into OpenSpec; Add change proposal from plan; Update existing OpenSpec project; Initialize OpenSpec in requirements folder. Part of cursor-rules-java project