fix: harden model catalog projections

backend/test/list-models.test.ts

@@ -6,6 +6,7 @@ import { join } from "node:path";
 import path from "node:path";
 import { createPiModelLister } from "../src/pi/list-models.js";
 import { loadConfig } from "../src/config.js";
+import type { RuntimeModel, RuntimeModelCatalog } from "../src/models/runtime-model-catalog.js";
 
 const FAKE = path.resolve("../harness/tests/fake_pi/fake_pi_rpc.mjs");
 
@@ -44,6 +45,36 @@ test("createPiModelLister returns mapped PiModel[] from get_available_models", a
   }
 });
 
+test("catalog listing translates upstream Pi IDs back to canonical model keys", async () => {
+  const script = scriptWith([
+    { provider: "local", id: "qwen2.5:7b", name: "Upstream label", reasoning: false },
+  ]);
+  const model: RuntimeModel = {
+    id: "local/qwen", provider: "local", model: "qwen", label: "Catalog Qwen",
+    upstreamModel: "qwen2.5:7b", endpoint: { baseUrl: "http://ollama:11434/v1" },
+    authentication: { mode: "none" }, sessionAdapter: { mode: "openai_compatible" },
+    session: { reasoning: true, contextWindow: 32768, maxTokens: 8192 },
+  };
+  const modelCatalog: RuntimeModelCatalog = {
+    defaultSession: model.id, defaultMetadataGeneration: null, embedding: null,
+    sessionModels: () => [model], metadataModels: () => [], hasSession: (id) => id === model.id,
+  };
+  try {
+    const lister = createPiModelLister(loadConfig({ THT_HARNESS_DIR: "../harness" }), {
+      ...noManagedModels,
+      modelCatalog,
+      loadEnabledModels: enabled("local/qwen2.5:7b"),
+      spawnFn: () => spawn("node", [FAKE, script]) as any,
+    });
+
+    await expect(lister()).resolves.toEqual([{
+      provider: "local", id: "qwen", name: "Catalog Qwen", reasoning: true,
+    }]);
+  } finally {
+    rmSync(path.dirname(script), { recursive: true, force: true });
+  }
+});
+
 test("createPiModelLister caches within ttl (spawns once for two calls)", async () => {
   const script = scriptWith([{ provider: "zai", id: "glm-5.2", name: "GLM 5.2", reasoning: true }]);
   try {