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## Summary - run the split stdout/stderr PTY test through the normal shell helper on every platform - use a Windows-native command string instead of depending on Python to emit split streams - assert CRLF line endings on Windows explicitly ## Why this fixes the flake The earlier PTY split-output test used a Python one-liner on Windows while the rest of the file exercised shell-command behavior. That made the test depend on runner-local Python availability and masked the real Windows shell output shape. Using a native cmd-compatible command and asserting the actual CRLF output makes the split stdout/stderr coverage deterministic on Windows runners.