Apply suggestion from @greptile-apps[bot]

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

scripts/pw/index.ts

@@ -27,15 +27,15 @@ async function cmdRun(): Promise<void> {
 
 	const { worktreeNum } = entry;
 
-	killOwnPorts(worktreeNum);
-	killTmuxSession(tmuxSessionName(worktreeNum));
-
 	if (process.env.PW_MODE !== "1") {
 		fatal(
 			"PW_MODE=1 not set. Run via 'bun pw' (package.json script) — required so preload-env.ts skips .env.local.",
 		);
 	}
 
+	killOwnPorts(worktreeNum);
+	killTmuxSession(tmuxSessionName(worktreeNum));
+
 	const offset = (worktreeNum - 1) * 100;
 	const env: Record<string, string> = {
 		...(process.env as Record<string, string>),