feat: unify installation model catalog

deploy/workspaces/example.yaml

@@ -1,8 +1,8 @@
 workspace:
-  schema_version: 3
+  schema_version: 4
   id: example
   name: Example workspace
-  description: Generic example WorkspaceV3 descriptor.
+  description: Generic example WorkspaceV4 descriptor.
   language: en
 
 dwh:
@@ -13,17 +13,6 @@ dwh:
     - postgres_direct
     - rest_api
 
-semantic_index:
-  vector_store:
-    engine: qdrant
-    collection: example
-    dimensions: 1024
-    distance: cosine
-  embedding:
-    provider: ollama_internal
-    model: qwen3-embedding:0.6b
-    dimensions: 1024
-
 evidence:
   source:
     type: filesystem
@@ -35,11 +24,6 @@ evidence:
     max_chunk_chars: 4000
     retain_published_generations: 3
 
-llm_policy:
-  default: zai/glm-5.2
-  allowed:
-    - zai/glm-5.2
-
 diagnostics:
   dwh_rest:
     method: GET