fix(runner): preserve native Codex reasoning effort

Keep selected and saved effort in the existing native builder while excluding Codex effort from other providers. Update the existing builder contract and regression controls.

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

packages/adapters/codex-local/src/ui/build-config.test.ts

@@ -118,6 +118,11 @@ describe("buildCodexLocalConfig", () => {
 });
 
 describe("buildPaperclipRunnerConfig", () => {
+  it.each(["", "max"])("preserves or overrides saved native Codex reasoning effort (%s)", thinkingEffort => {
+    const values = makeValues({ thinkingEffort, adapterSchemaValues: { provider: "codex", modelReasoningEffort: "high" } });
+    expect(buildPaperclipRunnerConfig(values).modelReasoningEffort).toBe(thinkingEffort || "high");
+    expect(buildPaperclipRunnerConfig({ ...values, adapterSchemaValues: { provider: "acpx", acpxAgent: "claude", modelReasoningEffort: "high" } })).not.toHaveProperty("modelReasoningEffort");
+  });
   it.each([undefined, false, true])("preserves Dot attachment consent in create/import forms: %s", value => {
     const config = buildPaperclipRunnerConfig(makeValues({ adapterType: "paperclip_runner", adapterSchemaValues: { provider: "openai_dot", dotAttachmentAccess: value } }));
     expect(config.dotAttachmentAccess).toBe(value === true);
@@ -142,6 +147,7 @@ describe("buildPaperclipRunnerConfig", () => {
       codexPermissionMode: "never",
       lifecycleMode: "per_turn",
       model: "gpt-5.4",
+      modelReasoningEffort: "high",
       timeoutSec: 0,
       graceSec: 15,
     });
@@ -149,7 +155,6 @@ describe("buildPaperclipRunnerConfig", () => {
       "engine",
       "agentCommand",
       "stateDir",
-      "modelReasoningEffort",
       "search",
       "fastMode",
       "dangerouslyBypassApprovalsAndSandbox",

packages/adapters/codex-local/src/ui/build-config.ts

@@ -76,6 +76,7 @@ export function buildCodexLocalConfig(v: CreateConfigValues): Record<string, unk
 export function buildPaperclipRunnerConfig(v: CreateConfigValues): Record<string, unknown> {
   const config = buildCodexLocalConfig(v);
   const schemaValues = normalizeLegacyRunnerProvider({ ...(v.adapterSchemaValues ?? {}) });
+  const codexReasoningEffort = config.modelReasoningEffort ?? schemaValues.modelReasoningEffort ?? schemaValues.reasoningEffort;
   for (const unsupportedKey of [
     "engine",
     "agentCommand",
@@ -232,7 +233,8 @@ export function buildPaperclipRunnerConfig(v: CreateConfigValues): Record<string
     ...schemaValues,
     provider,
     ...(provider === "codex"
-      ? { model: resolvePaperclipRunnerModel("codex", config.model) }
+      ? { model: resolvePaperclipRunnerModel("codex", config.model),
+          ...(codexReasoningEffort !== undefined ? { modelReasoningEffort: codexReasoningEffort } : {}) }
       : {}),
     codexPermissionMode: "never",
     opencodePermissionMode: resolvePaperclipRunnerPermissionMode(