refactor(launcher): split CLI flow into command modules

Isolate process-side effects behind adapter seams and keep wrapper behavior stable while improving command-level testability.

launcher/commands/app-command.ts

@@ -0,0 +1,20 @@
+import { launchTexthookerOnly, runAppCommandWithInherit } from '../mpv.js';
+import type { LauncherCommandContext } from './context.js';
+
+export function runAppPassthroughCommand(context: LauncherCommandContext): boolean {
+  const { args, appPath } = context;
+  if (!args.appPassthrough || !appPath) {
+    return false;
+  }
+  runAppCommandWithInherit(appPath, args.appArgs);
+  return true;
+}
+
+export function runTexthookerCommand(context: LauncherCommandContext): boolean {
+  const { args, appPath } = context;
+  if (!args.texthookerOnly || !appPath) {
+    return false;
+  }
+  launchTexthookerOnly(appPath, args);
+  return true;
+}