* docs: expand bubble sort docstrings with algorithm explanation Add a concise description of how bubble sort works (repeated adjacent comparisons/swaps until a pass makes no swaps) and note time/space complexity for both the iterative and recursive implementations. No behavior changes; all existing doctests pass. * Fix Ruff 0.16 lint failures * S310 --------- Co-authored-by: Christian Clauss <cclauss@me.com>