Too few iterations

Default `--iterations 5` gives a median from 5 samples. On the same commit, tasks like `retrieval_core` and `ordering_core` show 37–38% delta.

Start by locating the CLI entry point that defines the default `--iterations 5` value and reproduce the reported variation on `retrieval_core` and `ordering_core`. Determine the intended iteration count from the project’s existing behavior or guidance; done should include a documented, repeatable result showing that the default produces stable measurements.

Written by the indexing model from the issue text.