feat: establish unified administration and model context baseline

backend/test/pi-provider-smoke.test.ts

@@ -61,20 +61,22 @@ test("provider smoke resolves the selected catalog credential from the secret bu
     session: { reasoning: false },
   };
   const modelCatalog: RuntimeModelCatalog = {
-    defaultSession: model.id,
-    defaultMetadataGeneration: null,
+    defaultInteraction: model.id,
     embedding: null,
     sessionModels: () => [model],
     metadataModels: () => [],
     hasSession: (id) => id === model.id,
   };
   let spawnEnv: NodeJS.ProcessEnv | undefined;
+  const readAuthStore = vi.fn(() => JSON.stringify({ openai: { type: "api_key", key: "stale-key" } }));
   const smoke = createPiProviderSmoke(loadConfig({ THT_SECRETS_FILE: secret }), {
     modelCatalog,
-    authProviders: () => new Set(),
+    authProviders: () => new Set(["openai"]),
+    readAuthStore,
     readModelsStore: () => undefined,
     spawnFn: (_command, _args, options) => {
       spawnEnv = options.env;
+      expect(existsSync(join(options.env.PI_CODING_AGENT_DIR!, "auth.json"))).toBe(false);
       return successfulProviderChild();
     },
   });
@@ -85,6 +87,7 @@ test("provider smoke resolves the selected catalog credential from the secret bu
     expect(spawnEnv?.ZAI_API_KEY).toBe("catalog-secret");
     expect(spawnEnv).not.toHaveProperty("OPENAI_API_KEY");
     expect(spawnEnv).not.toHaveProperty("THT_MODEL_API_KEY");
+    expect(readAuthStore).not.toHaveBeenCalled();
   } finally {
     rmSync(root, { recursive: true, force: true });
   }
@@ -306,7 +309,7 @@ test("provider smoke makes one configured request from an isolated no-capability
     sessionAdapter: { mode: "pi_builtin" }, session: { reasoning: true },
   };
   const smokeCatalog: RuntimeModelCatalog = {
-    defaultSession: smokeModel.id, defaultMetadataGeneration: null, embedding: null,
+    defaultInteraction: smokeModel.id, embedding: null,
     sessionModels: () => [smokeModel], metadataModels: () => [],
     hasSession: (id) => id === smokeModel.id,
   };