- Fix slices.Delete while iterating bug in cookies_auth.go
- Fix Cookie.Parse to handle '=' chars in values using SplitN
- Add case-insensitive file extension handling in GetAuthDataFromFile
- Remove unreachable default case in Secret.Validate
- Make LookupURL/LookupURLX consistent with LookupAddr (use len>0)
- Improve comments for clarity
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>