fix: Add cross-platform fallback preamble to create-new-skill.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/compound-engineering/skills/create-agent-skills/workflows/create-new-skill.md

@@ -1,3 +1,9 @@
+## Interaction Method
+
+If `AskUserQuestion` is available, use it for all prompts below.
+
+If not, present each question as a numbered list and wait for a reply before proceeding to the next step. For multiSelect questions, accept comma-separated numbers (e.g. `1, 3`). Never skip or auto-configure.
+
 # Workflow: Create a New Skill
 
 <required_reading>