Added

• Request throttling for rate-limited hosts (e.g. pypistats.org) to avoid 429s

Changed

• CI workflow now tests on Python 3.8 through 3.14
• Safe date parsing for Python version breakdown (handles invalid date strings)
• More robust repository URL handling: strip .git suffix only when URL ends with .git
• Renamed loop variable os to os_stat in models to avoid shadowing the os module