Complete CommerceCanon rename and declare concept ownership boundary

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

registry/indexes/capabilities.yaml

@@ -9,7 +9,7 @@ capabilities:
   vector: D3 / A0 / C1 / R0
   domain: helix_forge
   status: draft
-  owner: identity-canon
+  owner: commerce-canon
   path: registry/capabilities/capability.identity.subject-resolution.md
   tags:
   - identity
@@ -24,7 +24,7 @@ capabilities:
   vector: D4 / A0 / C2 / R0
   domain: helix_forge
   status: draft
-  owner: identity-canon
+  owner: commerce-canon
   path: registry/capabilities/capability.identity.vocabulary-canonicalize.md
   tags:
   - identity