Org rename (case-only) not updating owners.username; stale casing breaks source fetch

[minori-fh]

Describe the bug Username updates are gated by a case-insensitive check (owner.username.lower() != username.lower()), so a case-only rename is ignored

To Reproduce Rename GH org case; run org/repo sync; observe no update to owners.username

Expected behavior Proper update to owners.username