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When hdiutil refuses a private read-only attachment because another owner already attached the same image, the native DMG reader now reports unknown container-entry coverage with a busy-attachment limitation instead of failing the whole inventory. Root identity, digest and the failed attach command provenance are retained; the existing attachment is never traversed, borrowed or detached. The downgrade applies only when the pre-attach hdiutil inventory lists the same image path and ownership reconciliation finds no new mount under the reader's root; every other attach failure stays a typed failure. Fixes #5546 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>