Run #19

Hermes Agent warned users about unsupported pip installs and fixed stale update checks.

This matters because users upgrading via pip would see incorrect update counts and miss critical warnings, causing confusion and support issues.

Use the updated banner warning to inform users that pip installs are not officially supported and to use the proper installation method.

Commit: 689ef5e | Tests: 2 | Signal: pip install warnings and cache invalidation now work correctly.