envtest: assert orphaned + spec.networking-absent never deletes adopted objects (replicas>1)

[bdchatham]

Problem

The orphan-and-adopt preserve gate (networkingOrphaned → skip reconcileNetworking, preserve ExternalAddress, ownership-checked deletes) is covered by TestNetworking_Orphaned_PreservesExternalAddressAfterNetworkingRemoved for the single-replica case, but there is no envtest exercising the replicas>1 combination (orphaned + spec.networking removed across multiple child SeiNodes).

Impact

The per-child preserve gate is group-scoped and reasoned to apply uniformly across replicas (verified live on node-wave-0 replicas=3 and the validator batches), but a replicas>1 envtest would close the proof rather than reason it — hardening the invariant the whole orphan-and-adopt flow rests on.

Proposed approach

Add an envtest at replicas=3: orphan annotation set + spec.networking removed in one edit; assert all child SeiNodes retain ExternalAddress and no adopted Service/HTTPRoute is deleted.

Relevant experts

kubernetes-specialist

Note

The SeiNodeDeployment → SeiNetwork refactor will reshape this controller; coordinate the test's home with that design.