Register shard-wiki capability.wiki.derived-views (planned)

Completes shard-wiki's capability registration (8 wiki.* entries; index 20).
reuse-surface validate: ok. Source: shard-wiki SHARD-WP-0013 T3.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

registry/indexes/capabilities.yaml

@@ -210,3 +210,14 @@ capabilities:
     path: registry/capabilities/capability.wiki.engine-typed-extensions.md
     tags: [wiki, engine, typed-extensions, feature-activation, shard-wiki]
     consumption_modes: [informational]
+
+  - id: capability.wiki.derived-views
+    name: Wiki Derived Views
+    summary: Recomputable views over a wiki union — BackLinks, RecentChanges, AllPages, SiteMap, and (delegate-or-derive) Search — carrying provenance.
+    vector: D3 / A0 / C0 / R0
+    domain: helix_forge
+    status: draft
+    owner: shard-wiki
+    path: registry/capabilities/capability.wiki.derived-views.md
+    tags: [wiki, derived-views, backlinks, recentchanges, search, shard-wiki]
+    consumption_modes: [informational]