Function run_suite 

pub async fn run_suite(
    executor: &dyn EvalExecutor,
    suite: &EvalSuite,
) -> Result<EvalReport>

Pure orchestration core: loop tasks × attempts through the executor, compute per-task metrics, and assemble the report.

This function performs no file I/O, no config reads, and no trust checks — those belong to the caller. It depends only on EvalExecutor, which makes it fully unit-testable with an in-memory fake (see executor::tests).