Definition of Done: Please mark each item below with ( / ) if completed or ( x ) if incomplete: ( ) The acceptance criteria defined below are met. Given interface eth0 has alt-name 'uplink-wan' and IP 192.0.2.1/24 with alt-name 'gateway-nic',  When a sysadmin applies Nmstate config with: VLAN vlan.101 using base-iface: 'uplink-wan' Static route to 10.0.0.0/8 using next-hop-iface: 'gateway-nic' Then, Nmstate resolves alt-names to eth0, creates vlan.101 on eth0 (verified by ip -d link show vlan.101 showing parent eth0), creates the route with eth0 as output interface (verified by ip route show 10.0.0.0/8), and exits with code 0 — Given no interface has alt-name 'nonexistent-link', and both eth0 and eth1 have alt-name 'ambiguous-name' (misconfiguration), When sysadmin applies Nmstate config referencing: 'nonexistent-link' as a bond port 'ambiguous-name' as a VLAN base-iface Then Nmstate exits with code 1 and error messages indicate: For 'nonexistent-link': interface with name or alt-name not found For 'ambiguous-name': alt-name matches multiple interfaces (eth0, eth1) ( ) Integration test case is available upstream. ( ) Code is reviewed and merged upstream. ( ) Preliminary testing is done. ( ) Upstream documentation is written in the upstream MR. ( ) Release notes text is written in the RHEL issue. ( ) A demo is recorded