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-infra.md

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+# Cleanup packet — railiance-infra
+
+From POLICY-NEXUS-WP-0003-T05. Shared with `railiance-hosts`.
+
+## Already ruled
+
+- `docs/adr/ADR-002-repo-boundary-hosts-vs-bootstrap.md` — superseded by
+  ADR-003. Add YAML `status: superseded`. Identical hosts copy exists.
+
+## Conflict — do not publish both
+
+Byte-identical accepted copies also live in `railiance-hosts`:
+
+- `ADR-003-railiance-5repo-stack-architecture.md`
+- `ADR-004-forgejo-in-cluster-actions-runner.md`
+
+One current publication source, not two. See the hosts packet.
+
+## Still unreviewed here
+
+- `docs/adr/ADR-005-k3s-api-tunnel-only.md` — relevance not ruled. If it
+  still binds cluster access, add publication front-matter and a unique
+  id (`RINFRA-ADR-0005`).