lduchosal / ipnetwork / 23983593097

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fix: NullReferenceException on IPv6 /128 networks in CLI output

Removed redundant .ToString() calls on nullable properties (Broadcast,
FirstUsable, LastUsable, Network, Netmask). string.Format handles null
safely, .ToString() on null does not.

Also fixed release workflow: macos-13 runner retired, --skip-duplicate
for NuGet push.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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