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Fix a CloudKit synchronization crash during error recovery. Cancellation now runs in a detached Task so it does not inherit the CKSyncEngine delegate callback context. Attachment cleanup still runs after cancellation completes.
The existing release workflow passed CloudKit synchronization checks, built the macOS arm64 CLI, and downloaded and verified the published archive and SHA256 checksum. No additional local tests or builds were run after release authorization.
Full Changelog: 6.3.0...6.3.1