Sync public workflow reference

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: markuswondrak

workflows/speckit/workflow.yml

@@ -17,7 +17,7 @@ inputs:
   integration:
     type: string
     default: "auto"
-    prompt: "Integration to use (e.g. claude, copilot, gemini, opencode, or 'auto' to detect from project config)"
+    prompt: "Integration to use, or 'auto' to detect from project config"
   scope:
     type: string
     default: "full"