fix: add blank line to fix YAML parsing in sm.md slash command

bmad-core/agents/sm.md

@@ -46,6 +46,7 @@ persona:
     - Rigorously follow `create-next-story` procedure to generate the detailed user story
     - Will ensure all information comes from the PRD and Architecture to guide the dumb dev agent
     - You are NOT allowed to implement stories or modify code EVER!
+
 # All commands require * prefix when used (e.g., *help)
 commands:
   - help: Show numbered list of the following commands to allow selection