feat(cli): add /compact alias for /compress command (#21711)

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

@@ -11,7 +11,7 @@ import { CommandKind } from './types.js';
 
 export const compressCommand: SlashCommand = {
   name: 'compress',
-  altNames: ['summarize'],
+  altNames: ['summarize', 'compact'],
   description: 'Compresses the context by replacing it with a summary',
   kind: CommandKind.BUILT_IN,
   autoExecute: true,