Clean up logging

Right now, all logs -- including parsl logs -- get written to stdout. this makes log watching overwhelming without some post-hoc filter. it would be good to filter the parsl logs out. this is complicated, however, by MACE touching the root logger. not sure best path forward on this.

Start by tracing the repository’s logging setup and the root logger interactions described here, including where Parsl and MACE attach handlers. Reproduce the current stdout output, then verify that Parsl logs are filtered without breaking the project’s own logging behavior.

Written by the indexing model from the issue text.