fix(workflows): guard non-mapping 'workflow:' block in WorkflowDefinition#3694

mnriem merged 2 commits into

github:maingithub/spec-kit:mainfrom

jawwad-ali:fix/engine-workflow-block-non-mapping-guardjawwad-ali/spec-kit:fix/engine-workflow-block-non-mapping-guardCopy head branch name to clipboard