Use when the user wants to BUILD, AUTHOR, or PUBLISH a reusable WORKFLOW EXTENSION PACKAGE — a versioned, shippable `cinatra.kind:"workflow"` package (a `cinatra/workflow.bpmn` declarative definition) that anyone can install. DISTINCT from chat-workflow-authoring, which creates a one-off workflow DRAFT/INSTANCE (a planned run on the Gantt). Scaffold → write → validate → build → publish via the workflow_source_* tools. Read chat-extension-authoring-core first.
