- Make validation constants internal and expose via InternalsVisibleTo so tests reference single source of truth
- Add empty-string guard to IsValidConfiguredInstanceName to prevent IndexOutOfRangeException
- Add ClusteringFeature_UsesConfiguredInstanceNameProvider test for Features.ClusteringFeature to match existing ShellFeatures coverage
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Forward-port the opt-in stable application instance name support from PR #7734 so clustered deployments can reuse per-instance transport entities across restarts while preserving random names by default.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>