fix(codex): update tests to work with conditional agentapi module

- Only set install_agentapi when explicitly installing real AgentAPI
- Let enable_tasks (defaults to true) control agentapi module in tests
- This fixes tests that were inadvertently triggering standalone mode

All 18 tests now pass ✅

registry/coder-labs/modules/codex/main.test.ts

@@ -41,15 +41,25 @@ interface SetupProps {
 
 const setup = async (props?: SetupProps): Promise<{ id: string }> => {
   const projectDir = "/home/coder/project";
+  
+  const moduleVars: Record<string, string> = {
+    install_codex: props?.skipCodexMock ? "true" : "false",
+    codex_model: "gpt-4-turbo",
+    workdir: "/home/coder",
+    ...props?.moduleVariables,
+  };
+  
+  // For backward compatibility: install_agentapi takes precedence over enable_tasks
+  // Only set install_agentapi when explicitly installing real AgentAPI
+  if (props?.skipAgentAPIMock) {
+    moduleVars.install_agentapi = "true";
+  }
+  // Otherwise, let enable_tasks control whether agentapi module runs
+  // (defaults to true unless explicitly disabled in moduleVariables)
+  
   const { id } = await setupUtil({
     moduleDir: import.meta.dir,
-    moduleVariables: {
-      install_codex: props?.skipCodexMock ? "true" : "false",
-      install_agentapi: props?.skipAgentAPIMock ? "true" : "false",
-      codex_model: "gpt-4-turbo",
-      workdir: "/home/coder",
-      ...props?.moduleVariables,
-    },
+    moduleVariables: moduleVars,
     registerCleanup,
     projectDir,
     skipAgentAPIMock: props?.skipAgentAPIMock,