Publish the policy-nexus arc42 stub

Inventory now discovers docs/architecture and registers the local
first-wave stub at /architecture/policy-nexus/v0.1/.

build/publication-manifest.json

@@ -17,6 +17,23 @@
       "status": "proposed",
       "title": "NetKingdom Tenancy Posture v0.1"
     },
+    {
+      "canonical_path": "architecture/policy-nexus/v0.1/index.html",
+      "currency": "current",
+      "id": "policy-nexus-architecture",
+      "last_reviewed": "2026-08-18",
+      "lifecycle": "active",
+      "owner": "the-custodian",
+      "review_due": "2027-02-18",
+      "revision": "draft-1",
+      "revision_path": "architecture/policy-nexus/v0.1/revisions/draft-1/index.html",
+      "source_digest": "179cbb86bca95f71f46f51ca1971ff1c274eed7d900adf0672b537d4bcc5b480",
+      "source_path": "docs/architecture/policy-nexus_v0.1.md",
+      "source_repo": "policy-nexus",
+      "source_revision": "a8fb62a3bcbff3daf03e5d3d56c3ca3a5bd991f8",
+      "status": "proposed",
+      "title": "Policy Nexus architecture"
+    },
     {
       "canonical_path": "adr/addressing-and-permanence/v1/index.html",
       "currency": "current",
@@ -30,7 +47,7 @@
       "source_digest": "a28668fb4b8b6c5ec8c94baac000061276d85ef1849ec7ab8d132b913dbfe3be",
       "source_path": "docs/adr/ADR-0001-addressing-and-permanence.md",
       "source_repo": "policy-nexus",
-      "source_revision": "7a24e9107fd62772a82d8b2a69692a09ce88eea9+working-tree.a28668fb4b8b",
+      "source_revision": "a8fb62a3bcbff3daf03e5d3d56c3ca3a5bd991f8",
       "status": "accepted",
       "title": "Policy addressing and permanence"
     },