fix: init-xdg help and platform message

packages/coding-agent/src/cli/commands/init-xdg.ts

@@ -6,7 +6,7 @@ const APP_NAME = "omp";
 
 export async function initXdg(): Promise<void> {
 	if (process.platform !== "linux" && process.platform !== "darwin") {
-		console.error("XDG directory setup is only supported on Linux.");
+		console.error("XDG directory setup is only supported on Linux and macOS.");
 		process.exit(1);
 	}
 

packages/coding-agent/src/cli/config-cli.ts

@@ -397,7 +397,7 @@ ${chalk.bold("Commands:")}
   set <key> <value>  Set a setting value
   reset <key>        Reset a setting to its default value
   path               Print the config directory path
-  init-xdg           Initialize XDG Base Directory structure (Linux only)
+  init-xdg           Initialize XDG Base Directory structure
 
 ${chalk.bold("Options:")}
   --json             Output as JSON