Add listProviderModels() to DaemonClient + E2E tests

Add method to query available models for Claude and Codex providers without
requiring an active agent. E2E tests verify both providers return model lists
with expected structure (id, label, provider).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/server/src/server/daemon.e2e.test.ts

@@ -1454,4 +1454,54 @@ describe("daemon E2E", () => {
       60000 // 1 minute timeout
     );
   });
+
+  describe("listProviderModels", () => {
+    test(
+      "returns model list for Codex provider",
+      async () => {
+        // List models for Codex provider - no agent needed
+        const result = await ctx.client.listProviderModels("codex");
+
+        // Verify response structure
+        expect(result.provider).toBe("codex");
+        expect(result.error).toBeNull();
+        expect(result.fetchedAt).toBeTruthy();
+
+        // Should return at least one model
+        expect(result.models).toBeTruthy();
+        expect(result.models.length).toBeGreaterThan(0);
+
+        // Verify model structure
+        const model = result.models[0];
+        expect(model.provider).toBe("codex");
+        expect(model.id).toBeTruthy();
+        expect(model.label).toBeTruthy();
+      },
+      60000 // 1 minute timeout
+    );
+
+    test(
+      "returns model list for Claude provider",
+      async () => {
+        // List models for Claude provider - no agent needed
+        const result = await ctx.client.listProviderModels("claude");
+
+        // Verify response structure
+        expect(result.provider).toBe("claude");
+        expect(result.error).toBeNull();
+        expect(result.fetchedAt).toBeTruthy();
+
+        // Should return at least one model
+        expect(result.models).toBeTruthy();
+        expect(result.models.length).toBeGreaterThan(0);
+
+        // Verify model structure
+        const model = result.models[0];
+        expect(model.provider).toBe("claude");
+        expect(model.id).toBeTruthy();
+        expect(model.label).toBeTruthy();
+      },
+      60000 // 1 minute timeout
+    );
+  });
 });

packages/server/src/server/test-utils/daemon-client.ts

@@ -8,6 +8,7 @@ import type {
   PersistedAgentDescriptorPayload,
 } from "../messages.js";
 import type {
+  AgentModelDefinition,
   AgentPermissionRequest,
   AgentPermissionResponse,
   AgentPersistenceHandle,
@@ -489,6 +490,47 @@ export class DaemonClient {
     );
   }
 
+  // ============================================================================
+  // Provider Models
+  // ============================================================================
+
+  async listProviderModels(
+    provider: AgentProvider,
+    options?: { cwd?: string }
+  ): Promise<{
+    provider: AgentProvider;
+    models: AgentModelDefinition[];
+    fetchedAt: string;
+    error: string | null;
+  }> {
+    const startPosition = this.messageQueue.length;
+
+    this.send({
+      type: "list_provider_models_request",
+      provider,
+      cwd: options?.cwd,
+    });
+
+    return this.waitFor(
+      (msg) => {
+        if (
+          msg.type === "list_provider_models_response" &&
+          msg.payload.provider === provider
+        ) {
+          return {
+            provider: msg.payload.provider,
+            models: msg.payload.models ?? [],
+            fetchedAt: msg.payload.fetchedAt,
+            error: msg.payload.error ?? null,
+          };
+        }
+        return null;
+      },
+      30000,
+      { skipQueueBefore: startPosition }
+    );
+  }
+
   // ============================================================================
   // Permissions
   // ============================================================================