idea: automate storing logs in "standard" `logs/` if BIDS dataset is detected

Relates to fresh
- https://github.com/bids-standard/bids-specification/pull/1962

so, if accepted, and path prefix is not specified explicitly, if we detect running under BIDS dataset -- store under `logs/...` ?

Start by reviewing the linked bids-standard pull request and then trace how duct currently handles an unspecified path prefix and stores logs. The issue does not name files or tests; done should mean that a detected BIDS dataset uses the standard logs/ location only when no path prefix was explicitly provided.

Written by the indexing model from the issue text.