WIP: Investigate PTY-based TeeStream for interleaving (#313)#370

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Commits on Jan 16, 2026

WIP: Reintroduce TeeStream (PTY-based) for #313 investigation

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claude
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[DATALAD RUNCMD] Auto-fix: Update formatting and README help text
actions-user
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Rename PTY fds and clarify TeeStream data flow

asmacdo
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claude
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