Add pointer infospace for the first-wave architecture collection

Five system entities reference owning-repo documents. No copied bodies.

canon/architecture/infospace/entities/coulomb-estate.md

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+# Coulomb Estate
+
+## Definition
+
+Estate map. Canons, hubs, rails, and publication. Owned by
+the-custodian.
+
+## Source Chapter
+
+`the-custodian` `canon/architecture/coulomb-estate_v0.1.md` —
+published at `/architecture/coulomb-estate/v0.1/`.

canon/architecture/infospace/entities/net-kingdom.md

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+# NetKingdom
+
+## Definition
+
+Identity and tenancy security core. Owned by net-kingdom.
+
+## Source Chapter
+
+`net-kingdom` `docs/architecture/net-kingdom_v0.1.md` — published at
+`/architecture/net-kingdom/v0.1/`.

canon/architecture/infospace/entities/policy-nexus.md

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+# Policy Nexus
+
+## Definition
+
+Permanent publication surface for canon and ADRs. Owned by policy-nexus.
+
+## Source Chapter
+
+`policy-nexus` `docs/architecture/policy-nexus_v0.1.md` — published at
+`/architecture/policy-nexus/v0.1/`.

canon/architecture/infospace/entities/railiance.md

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+# Railiance
+
+## Definition
+
+Runtime substrate: rails, reefs, and rApps. Owned by railiance-master.
+
+## Source Chapter
+
+`railiance-master` `docs/architecture/railiance_v0.1.md` — published at
+`/architecture/railiance/v0.1/`.

canon/architecture/infospace/entities/state-hub.md

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+# State Hub
+
+## Definition
+
+Coordination read-model in active retirement. Owned by state-hub.
+
+## Source Chapter
+
+`state-hub` `docs/architecture/state-hub_v0.1.md` — published at
+`/architecture/state-hub/v0.1/`.