fix: tighten codex app-server lifecycle

extensions/codex/provider.ts

@@ -15,7 +15,6 @@ import {
   readCodexPluginConfig,
   resolveCodexAppServerRuntimeOptions,
 } from "./src/app-server/config.js";
-import { clearSharedCodexAppServerClient } from "./src/app-server/shared-client.js";
 
 const PROVIDER_ID = "codex";
 const CODEX_BASE_URL = "https://chatgpt.com/backend-api";
@@ -28,6 +27,7 @@ type CodexModelLister = (options: {
   timeoutMs: number;
   limit?: number;
   startOptions?: CodexAppServerStartOptions;
+  sharedClient?: boolean;
 }) => Promise<CodexAppServerModelListResult>;
 
 type BuildCodexProviderOptions = {
@@ -102,15 +102,11 @@ export async function buildCodexProviderCatalog(
   const timeoutMs = normalizeTimeoutMs(config.discovery?.timeoutMs);
   let discovered: CodexAppServerModel[] = [];
   if (config.discovery?.enabled !== false && !shouldSkipLiveDiscovery(options.env)) {
-    try {
-      discovered = await listModelsBestEffort({
-        listModels: options.listModels ?? listCodexAppServerModels,
-        timeoutMs,
-        startOptions: appServer.start,
-      });
-    } finally {
-      clearSharedCodexAppServerClient();
-    }
+    discovered = await listModelsBestEffort({
+      listModels: options.listModels ?? listCodexAppServerModels,
+      timeoutMs,
+      startOptions: appServer.start,
+    });
   }
   const models = (discovered.length > 0 ? discovered : FALLBACK_CODEX_MODELS).map(
     codexModelToDefinition,
@@ -180,6 +176,7 @@ async function listModelsBestEffort(params: {
       timeoutMs: params.timeoutMs,
       limit: 100,
       startOptions: params.startOptions,
+      sharedClient: false,
     });
     return result.models.filter((model) => !model.hidden);
   } catch {