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* feat(errors): add standard library errors wrappers Add ErrUnsupported sentinel and Join helper to mirror the standard library errors package, so callers can use them through the kratos errors package without importing the standard errors package directly. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * style(errors): wrap long doc comment lines under lll limit Reflow the Join doc comment so no line exceeds the 160-character lll linter limit. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>