Device records, interfaces, MACs and cabling are written by the
autodiscovery agent, and host names, roles and IP allocation by the UI, so
terraform declaring them fights both owners.
- drop the device, interface, MAC, per-host IP and net:<name> tag resources
- declare sites, device types, roles and platforms in their own config files
- add interface templates per device type and model the Omada SG3429X
- add per-site VLAN groups and VLANs, seeding vid 101 and 201 in syd1
- publish network profiles as site-scoped config contexts
- rename subnets to net-<a>-<b>-<c>-<d>-<len> and restore dns/domain/next_server
unkin-agent
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