rune v0.5.2 Security and identity fix for cross-namespace registries. - Credentials no longer persist in cached .git/config. Tokens injected transiently via GIT_ASKPASS, resolved fresh each operation. - Per-registry git identity (git_email, git_name) set on clone. Ensures rune push commits with the correct email for each namespace. - rune audit command for detecting content regressions across registries. - Rewritten README with multi-registry auth documentation.