feat: unify installation model catalog

backend/test/registry-evidence.test.ts

@@ -20,7 +20,7 @@ async function git(cwd: string, args: string[]): Promise<string> {
 }
 
 const descriptor = `workspace:
-  schema_version: 3
+  schema_version: 4
   id: research
   name: Research
   language: en
@@ -29,18 +29,6 @@ dwh:
   database: analytics
   schema: mart
   supported_transports: [postgres_direct]
-semantic_index:
-  vector_store:
-    engine: qdrant
-    collection: research
-    dimensions: 1024
-    distance: cosine
-  embedding:
-    provider: ollama_internal
-    model: qwen3-embedding:0.6b
-    dimensions: 1024
-llm_policy:
-  allowed: [zai/glm-5.2]
 evidence:
   source:
     type: filesystem