Promote capability.wiki.engine-typed-extensions D2->D3 (architecture authored)

WikiEngineCoreArchitecture.md authored in shard-wiki + INTENT amendment ratified;
discovery D2->D3 with promotion_history. reuse-surface validate: ok. Source: SHARD-WP-0013 T5/T6.

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

registry/capabilities/capability.wiki.engine-typed-extensions.md

@@ -9,13 +9,14 @@ tags: [wiki, engine, typed-extensions, feature-activation, shard-wiki]
 
 maturity:
   discovery:
-    current: D2
+    current: D3
     target: D5
     confidence: medium
     rationale: >
-      Bounded by SHARD-WP-0013 (wiki-engine prep): intent, scope, and the reconciliation
-      (engine as a reference canonical-mode shard backend) are defined; the architecture
-      (WikiEngineCoreArchitecture.md) and the typed-extension model are pending.
+      Architecture authored (shard-wiki/spec/WikiEngineCoreArchitecture.md): small page-store
+      kernel + typed-extension framework, per-shard activation, engine-as-canonical-mode-shard,
+      and a conflict-mediation realization are explored. Detailed extension SDK/ABI and the API
+      protocol remain (so D3 Explored, not yet D4/D5).
   availability:
     current: A0
     target: A4
@@ -61,7 +62,6 @@ availability:
   target_level: A4
   current_artifacts:
     - "shard-wiki/workplans/SHARD-WP-0013-wiki-engine-prep.md"
-  target_artifacts:
     - "shard-wiki/spec/WikiEngineCoreArchitecture.md"
   consumption_modes:
     - informational
@@ -84,7 +84,15 @@ consumer_guidance:
   not_recommended_for:
     - implementation reuse today (planning-stage)
   known_limitations:
-    - architecture pending; gated on a narrow INTENT amendment (SHARD-WP-0013 T4)
+    - architecture authored; extension SDK/ABI + API protocol still to design; not yet built
+
+promotion_history:
+  - date: "2026-06-15"
+    dimension: discovery
+    from: D2
+    to: D3
+    rationale: WikiEngineCoreArchitecture.md authored (kernel + typed-extension framework explored); INTENT amendment ratified.
+    author: shard-wiki
 ---
 
 # Wiki Engine with Typed Extensions
@@ -99,8 +107,9 @@ for other engines. Per-shard activation is a candidate consumer of
 ## Assessment notes
 
 ### Discovery
-Bounded by SHARD-WP-0013; the architecture (`WikiEngineCoreArchitecture.md`) and typed-extension
-model are the next deliverables, gated on a narrow INTENT amendment.
+Architecture authored: `shard-wiki/spec/WikiEngineCoreArchitecture.md` (small kernel +
+typed-extension framework; engine = canonical-mode shard). INTENT amendment ratified
+(2026-06-15, decision 84ffdb48). Extension SDK/ABI + API protocol are the next deliverables.
 
 ### Availability
 Planning-stage; informational reuse only.

registry/indexes/capabilities.yaml

@@ -203,7 +203,7 @@ capabilities:
   - id: capability.wiki.engine-typed-extensions
     name: Wiki Engine with Typed Extensions
     summary: A small-core wiki engine realizing a typed-extension framework that addresses all wiki use cases and lets each shard activate only the features it needs.
-    vector: D2 / A0 / C0 / R0
+    vector: D3 / A0 / C0 / R0
     domain: helix_forge
     status: draft
     owner: shard-wiki