cleanup(persistent-bash): drop impossible marker branch

packages/pty/tool-bash-persistent/src/index.ts

@@ -96,7 +96,6 @@ function commandOutput(
 ): CapturedOutput | undefined {
   const text = snapshot.text
   const end = text.lastIndexOf(marker.end)
-  if (end < 0) return undefined
   const status = /^(\d+)\r?\n/.exec(text.slice(end + marker.end.length))?.[1]
   if (status === undefined) return undefined
   const startMarker = text.lastIndexOf(marker.start, end)