March 2025 monthly summary for PyPSA/PyPSA: Implemented a stability improvement to ensure reproducible optimization results by making bus ordering deterministic in highly meshed networks. This was achieved by adding a pandas.sort_values() call in common.py, addressing nondeterministic ordering of strongly meshed buses. Release notes were updated to reflect the change. The fix reduces variability in optimization runs, enhances test reliability, and simplifies auditing of results across environments.