Complete REUSE-WP-0003: registry CLI, docs alignment, and coverage

Align INTENT.md with delivered layout, add CapabilityRegistryConcept guide,
extend schema with promotion_history, ship reuse-surface validate/query/export
CLI, register three more helix_forge capabilities, and refresh SCOPE and gap
analysis to reflect A3 tooling and D5/A3/C4/R2 self-assessment.

schemas/capability.schema.yaml

@@ -17,7 +17,7 @@ required:
 properties:
   id:
     type: string
-    pattern: '^capability\.[a-z0-9]+(\.[a-z0-9-]+)+$'
+    pattern: '^capability(\.[a-z][a-z0-9-]*)+$'
     description: Stable reverse-domain capability identifier.
   name:
     type: string
@@ -162,6 +162,10 @@ properties:
         type: array
         items:
           type: string
+  promotion_history:
+    type: array
+    items:
+      $ref: '#/$defs/promotionRecord'
 $defs:
   confidence:
     type: string
@@ -182,7 +186,7 @@ $defs:
     type: array
     items:
       type: string
-      pattern: '^capability\.[a-z0-9]+(\.[a-z0-9-]+)+$'
+      pattern: '^capability(\.[a-z][a-z0-9-]*)+$'
   internalMaturityDimension:
     type: object
     additionalProperties: false
@@ -244,4 +248,25 @@ $defs:
       known_reliability_risks:
         type: array
         items:
-          type: string
+          type: string
+  promotionDimension:
+    type: string
+    enum: [discovery, availability, completeness, reliability]
+  promotionRecord:
+    type: object
+    additionalProperties: false
+    required: [date, dimension, from, to, rationale]
+    properties:
+      date:
+        type: string
+        pattern: '^[0-9]{4}-[0-9]{2}-[0-9]{2}$'
+      dimension:
+        $ref: '#/$defs/promotionDimension'
+      from:
+        type: string
+      to:
+        type: string
+      rationale:
+        type: string
+      author:
+        type: string