fix(paseo-agent): use working OAuth catalog model

Live proof showed the previous OAuth catalog default was rejected at session start. Switch the catalog, docs, fixtures, and regenerated schema to the working default while keeping provider config generic.

packages/app/e2e/helpers/paseo-agent.ts

@@ -101,7 +101,7 @@ export async function seedChatGptProvider(providerName: string): Promise<void> {
       name: providerName,
       providerType: "chatgpt",
       options: {
-        models: [{ id: "gpt-5.3-codex", reasoning: true }],
+        models: [{ id: "gpt-5.4-mini", reasoning: true }],
       },
     });
     await client.storePaseoAgentOAuthCredential({

packages/protocol/src/messages.paseo-agent-config.test.ts

@@ -219,7 +219,7 @@ describe("Paseo Agent config RPC schemas", () => {
       name: "chatgpt",
       providerType: "openai-codex",
       options: {
-        models: [{ id: "gpt-5.3-codex", reasoning: true }],
+        models: [{ id: "gpt-5.4-mini", reasoning: true }],
       },
     });
 

packages/server/src/server/agent/providers/paseo-agent/catalog.ts

@@ -55,7 +55,7 @@ export const PASEO_AGENT_PROVIDER_CATALOG = [
     api: "openai-codex-responses",
     baseUrl: "https://chatgpt.com/backend-api",
     auth: { kind: "oauth", flow: "openai-codex" },
-    models: [{ id: "gpt-5.3-codex", reasoning: true }],
+    models: [{ id: "gpt-5.4-mini", reasoning: true }],
   },
   {
     id: "kimi",

packages/server/src/server/agent/providers/paseo-agent/config-service.test.ts

@@ -258,7 +258,7 @@ describe("PaseoAgentConfigService", () => {
       expect.objectContaining({
         name: "chatgpt",
         providerType: "chatgpt",
-        models: [{ id: "gpt-5.3-codex", reasoning: true }],
+        models: [{ id: "gpt-5.4-mini", reasoning: true }],
         auth: { kind: "oauth", configured: true, source: "stored" },
         available: true,
       }),

packages/server/src/server/agent/providers/paseo-agent/config.test.ts

@@ -107,7 +107,7 @@ describe("listPaseoAgentModels", () => {
     const models = listPaseoAgentModels(
       PaseoAgentConfigSchema.parse({ providers: { chatgpt: { type: "chatgpt" } } }),
     );
-    expect(models.map((m) => m.id)).toEqual(["chatgpt/gpt-5.3-codex"]);
+    expect(models.map((m) => m.id)).toEqual(["chatgpt/gpt-5.4-mini"]);
   });
 
   it("marks the configured default model", () => {
@@ -179,7 +179,7 @@ describe("paseoAgentModelProviders", () => {
     expect(provider.config.apiKey).toBeUndefined();
     expect(provider.config.api).toBe("openai-codex-responses");
     expect(provider.config.baseUrl).toBe("https://chatgpt.com/backend-api");
-    expect(provider.config.models?.[0]?.id).toBe("gpt-5.3-codex");
+    expect(provider.config.models?.[0]?.id).toBe("gpt-5.4-mini");
   });
 
   it("lets instance models override catalog default models", async () => {
@@ -205,7 +205,7 @@ describe("paseoAgentModelProviders", () => {
       }),
     );
     expect(provider.oauth).toEqual({ flow: "openai-codex" });
-    expect(provider.config.models?.[0]?.id).toBe("gpt-5.3-codex");
+    expect(provider.config.models?.[0]?.id).toBe("gpt-5.4-mini");
   });
 
   it("rejects unknown provider types at runtime with known ids", async () => {
@@ -295,7 +295,7 @@ describe("resolvePaseoAgentModel", () => {
         PaseoAgentConfigSchema.parse({ providers: { chatgpt: { type: "chatgpt" } } }),
         null,
       ),
-    ).toEqual({ provider: "chatgpt", id: "gpt-5.3-codex" });
+    ).toEqual({ provider: "chatgpt", id: "gpt-5.4-mini" });
   });
 
   it("ignores an implicit default whose provider is not registered", () => {