feat: default new Codex agents to the qualified Paperclip Runner

Resolve creation intent across onboarding, hires, imports, and the UI. Preserve existing execution and qualify automatic defaults for shipped Linux x64 artifacts.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/components/ConfigureBuiltInAgentModal.tsx

@@ -1,4 +1,7 @@
 import { useMemo, useState } from "react";
+import { agentHarnessType, agentRunner, type AgentRunnerChoice } from "@paperclipai/shared";
+import { adaptersApi } from "@/api/adapters";
+import { CodexRunnerSelect } from "./CodexRunnerSelect";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 
 import {
@@ -65,8 +68,11 @@ export function ConfigureBuiltInAgentModal({
   const { definition } = state;
 
   const [adapterType, setAdapterType] = useState<string>(
-    () => state.agent?.adapterType ?? defaultAdapterType(state),
+    () => state.agent && agentHarnessType(state.agent.adapterType, state.agent.adapterConfig) === "codex_local" ? "codex_local" : state.agent?.adapterType ?? defaultAdapterType(state),
   );
+  const [runner, setRunner] = useState<AgentRunnerChoice | undefined>();
+  const adapters = useQuery({ queryKey: queryKeys.adapters.all, queryFn: adaptersApi.list, enabled: open });
+  const codexAvailability = adapters.data?.find(item => item.type === "codex_local");
   const [model, setModel] = useState<string>(() => {
     const config = state.agent?.adapterConfig;
     const configuredModel = typeof config === "object" && config !== null
@@ -128,7 +134,8 @@ export function ConfigureBuiltInAgentModal({
       const adapterConfig: Record<string, unknown> = {};
       if (model.trim()) adapterConfig.model = model.trim();
       const result = await builtInAgentsApi.provision(companyId, definition.key, {
-        adapterType,
+        adapterType: state.agent && agentHarnessType(state.agent.adapterType, state.agent.adapterConfig) === adapterType ? state.agent.adapterType : adapterType,
+        ...(adapterType === "codex_local" && runner !== undefined ? { runner } : {}),
         adapterConfig,
         ...(budgetMonthlyCents !== undefined ? { budgetMonthlyCents } : {}),
       });
@@ -163,17 +170,25 @@ export function ConfigureBuiltInAgentModal({
             board.
           </InlineBanner>
 
-          <Field label="Adapter type">
+          <Field label="Harness">
             <AdapterTypeDropdown
               value={adapterType}
               onChange={(next) => {
                 setAdapterType(next);
                 setModel("");
+                setRunner(undefined);
               }}
               disabledTypes={disabledTypes}
             />
           </Field>
 
+          {adapterType === "codex_local" && <details className="space-y-3">
+            <summary className="cursor-pointer text-sm text-muted-foreground">Advanced</summary>
+            <CodexRunnerSelect value={runner ?? (state.agent ? agentRunner(state.agent.adapterType) : "auto")}
+              defaultRunner={codexAvailability?.defaultRunner} supportedRunners={codexAvailability?.supportedRunners}
+              onChange={setRunner} />
+          </details>}
+
           {modelRequired && (
             // ModelDropdown supplies its own "Model" Field label + hint.
             <ModelDropdown