feat: unify installation model catalog

backend/test/workspace-runtime-handoff.test.ts

@@ -21,7 +21,7 @@ const thtBin = join(harnessDir, ".venv", "bin", "tht");
 const roots: string[] = [];
 
 const canonicalWorkspace = `workspace:
-  schema_version: 3
+  schema_version: 4
   id: psd-clinical
   name: Runtime handoff
   language: en
@@ -30,18 +30,6 @@ dwh:
   database: analytics
   schema: mart
   supported_transports: [postgres_direct]
-semantic_index:
-  vector_store:
-    engine: qdrant
-    collection: psd-clinical
-    dimensions: 1024
-    distance: cosine
-  embedding:
-    provider: ollama_internal
-    model: qwen3-embedding:0.6b
-    dimensions: 1024
-llm_policy:
-  allowed: [zai/glm-5.2]
 `;
 
 const filesystemWorkspace = `${canonicalWorkspace}evidence:
@@ -145,7 +133,7 @@ function runnerFor(f: Awaited<ReturnType<typeof fixture>>): ThtRunner {
   } as any);
 }
 
-test("real schema-v3 registry revision loads through ThtRunner and the harness contract", async () => {
+test("real schema-v4 registry revision loads through ThtRunner and the harness contract", async () => {
   const f = await fixture();
   const runner = runnerFor(f);