rune v0.5.1
- feat: rune audit -- detect content regressions across registries
- docs: rewrite README with multi-registry auth guide
- Per-registry authentication (token_env, glab/gh auto-detect)
- Multiple GitLab identity pattern with RUNE_TOKEN_{NAME}
- Complete command table, lockfile model, upstream imports
- docs: generic examples (no specific registry names in README)