Deliver ADR cleanup packets and publish first-wave arc42 stubs

Packets go to seven owning repos by inbox and checklist. Railiance,
NetKingdom, and State Hub now have published architecture stubs.

docs/adr-review/packets/railiance-hosts.md

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+# Cleanup packet — railiance-hosts
+
+From POLICY-NEXUS-WP-0003-T05. Shared with `railiance-infra`.
+
+## Already ruled
+
+- `docs/adr/ADR-002-repo-boundary-hosts-vs-bootstrap.md` — superseded by
+  ADR-003. Add YAML `status: superseded` so the body and metadata agree.
+  Byte-identical copy exists in railiance-infra.
+
+## Conflict — do not publish both
+
+These files are **byte-identical** and **accepted** in both
+`railiance-hosts` and `railiance-infra`:
+
+- `ADR-003-railiance-5repo-stack-architecture.md`
+- `ADR-004-forgejo-in-cluster-actions-runner.md`
+
+Pick one publication source. The other becomes `superseded` or a
+pointer, not a second current document. If the stack story moved to
+`railiance-master`, say so.
+
+Who rules: railiance-hosts, railiance-infra, or railiance-master.
+Nothing is published from these two ADRs until that ruling lands.