v0.18.1

Fixed

• Kiro summary engine now actually summarizes. summary --engine kiro previously fed the activity report to kiro-cli on stdin while
  passing the prompt as a positional argument — but Kiro reads stdin
  only when no positional question is given, so it ignored the report
  and replied that the log was empty. The prompt and report are now
  combined onto stdin (no positional), so the model sees both. Claude
  and Codex are unaffected.
• No more EPIPE crash when an engine closes stdin early. Writing the
  large report to a child that had already closed its input surfaced as
  an unhandled EPIPE error and aborted the process; the stdin pipe now
  has an error handler, so the run degrades gracefully.