Function run_test_file_with_session 

pub fn run_test_file_with_session<'a>(
    path: &'a Path,
    filter: Option<&'a str>,
    timeout_ms: u64,
    execution_cwd: Option<&'a Path>,
    cli_skill_dirs: &'a [PathBuf],
    session: &'a TestRunSession,
) -> Pin<Box<dyn Future<Output = Result<Vec<TestResult>, String>> + 'a>>

Single-file test API that retains prepared artifacts across invocations.