chore: gitignore test-results/ and remove untracked demo artifacts

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

Author: acailic

.gitignore

@@ -54,3 +54,6 @@ node_modules/
 
 # Scheduled automation logs
 docs/superpowers/scheduled-reports/
+
+# Local demo/test artifacts
+test-results/