Enable local federation sources for sibling capability registries

Turn on state-hub, feature-control, identity-canon, and shard-wiki index
sources after establishing registries locally; federated compose now merges
35 capabilities across five repos.

registry/federation/sources.yaml

@@ -15,25 +15,32 @@ sources:
   # Enable when sibling repos publish registry/indexes/capabilities.yaml
   - repo: state-hub
     index: ~/state-hub/registry/indexes/capabilities.yaml
-    enabled: false
+    enabled: true
     required: false
     domain: helix_forge
     description: State Hub coordination capabilities
 
   - repo: feature-control
     index: ~/feature-control/registry/indexes/capabilities.yaml
-    enabled: false
+    enabled: true
     required: false
     domain: helix_forge
     description: Feature control domain capabilities
 
   - repo: identity-canon
     index: ~/identity-canon/registry/indexes/capabilities.yaml
-    enabled: false
+    enabled: true
     required: false
     domain: helix_forge
     description: Identity canon research capabilities
 
+  - repo: shard-wiki
+    index: ~/shard-wiki/registry/indexes/capabilities.yaml
+    enabled: true
+    required: false
+    domain: helix_forge
+    description: Shard wiki federation capabilities
+
   # Remote index example — enable when a repo publishes a raw capabilities.yaml URL
   - repo: example-remote
     url: https://example.com/registry/indexes/capabilities.yaml