Returns a 0-100 Python package ecosystem activity index (PyPI release velocity vs a 250/h baseline, new-package registration pace, bellwether download momentum for numpy/pandas/requests/boto3/torch; 50 = typical, hourly) with score, per-leg drivers, 10 most-recent releases, and bellwether download counts. Call when the user asks about PyPI activity, Python ecosystem momentum, or release surges, or when timing dependency refreshes, mirror syncs, or package launches. Updates: hourly.