sam a6180196e9 Fix MTU=0 validation and create_message_chunks import errors
- Send mtu=None instead of mtu=0 (NetBox requires MTU >= 1)
- Remove create_message_chunks usage (not in installed SDK version)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-28 16:58:18 -07:00
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