feat: Add /config refresh command (#4993)

Co-authored-by: Bryan Morgan <bryanmorgan@google.com>

packages/cli/src/ui/commands/configCommand.ts

@@ -0,0 +1,33 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import {
+  CommandKind,
+  SlashCommand,
+  SlashCommandActionReturn,
+} from './types.js';
+
+export const configCommand: SlashCommand = {
+  name: 'config',
+  description: 'Commands for interacting with the CLI configuration.',
+  kind: CommandKind.BUILT_IN,
+  subCommands: [
+    {
+      name: 'refresh',
+      description: 'Reload settings and extensions from the filesystem.',
+      kind: CommandKind.BUILT_IN,
+      action: async (context): Promise<SlashCommandActionReturn> => {
+        await context.ui.refreshConfig();
+        return {
+          type: 'message',
+          messageType: 'info',
+          content:
+            'Configuration, extensions, memory, and tools have been refreshed.',
+        };
+      },
+    },
+  ],
+};

packages/cli/src/ui/commands/types.ts

@@ -59,6 +59,7 @@ export interface CommandContext {
     /** Toggles a special display mode. */
     toggleCorgiMode: () => void;
     toggleVimEnabled: () => Promise<boolean>;
+    refreshConfig: () => Promise<void>;
   };
   // Session-specific data
   session: {