Publish reciprocal canon federation interface

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a070b5-4994-7271-bd8b-7c3dbcedec4b

infospace/agent/retrieval-index.yaml

@@ -1,6 +1,6 @@
 schema: info-tech-canon.retrieval-index.v1
 infospace: canon
-item_count: 80
+item_count: 81
 items:
 - id: assimilation/canon-federation
   kind: assimilation
@@ -667,6 +667,20 @@ items:
   - type: conforms_to
     target: standard/emission-cadence
   warnings: []
+- id: interface-card/canon-federation
+  kind: interface-card
+  title: InfoTechCanon federation interface
+  canonical_path: interfaces/federation.yaml
+  source_path: ../the-custodian/canon/architecture/adr-006-canon-federation-concept-ownership.md
+  summary: 'Canon artifact: InfoTechCanon federation interface.'
+  owned_concepts:
+  - InfoTechCanon federation interface
+  imports:
+  - kernel/itc-core
+  relationships:
+  - type: conforms_to
+    target: kernel/itc-core
+  warnings: []
 - id: kernel/itc-core
   kind: kernel
   title: InfoTechCanon Core