Exercise the mailu sync retry, attribute, and skip branches, the listener non-object JSON path, and the hygiene conftest skip; drop the unreachable inverted-range clamp in the semgrep report (the line helper already floors the end line) and pin that behavior with a test. Exclude the mailu __main__ guards from measurement. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>