The multi-line python3 -c block had unindented Python code that terminated the YAML block scalar, causing a preExecutionError on every CI run. Inline the Python as a one-liner. Also apply dart format to email_repository_impl.dart and email_repository_impl_test.dart (reformatted by CI container). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>