feat(cli)!: make dsh run the headless entrypoint

apps/cli/tests/headless-shutdown.e2e.ts

@@ -66,7 +66,7 @@ async function runHeadlessPtySmoke(): Promise<string> {
   try {
     const home = join(cwd, '.dsh')
     // Pre-initialize the headless profile with the never-dispose row in its
-    // user patch layer (the same file `dsh --profile headless` hot-reloads).
+    // user patch layer (the same file a long-lived profile boot hot-reloads).
     const profileDir = join(home, 'profiles', 'headless')
     await mkdir(profileDir, { recursive: true })
     await writeFile(join(profileDir, 'package.json'), JSON.stringify({
@@ -83,7 +83,7 @@ async function runHeadlessPtySmoke(): Promise<string> {
     ].join('\n'))
     const launch = resolveExampleLaunch({
       srcBin: dshBinScript,
-      configArgs: ['--profile', 'headless', 'never complete'],
+      configArgs: ['run', 'never complete'],
       tsconfigPath,
       env: {
         DSH_HOME: home,