gitignore: the hero take's test-results dir, like its siblings

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Author: midagedev

.gitignore

@@ -90,3 +90,4 @@ mobile/e2e/.shots/
 .playwright-mcp/
 e2e/demo/test-results-sprint/
 e2e/demo/test-results-retro/
+e2e/demo/test-results-sprint-retro-hero/