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Expose original file descriptor in CliRunner

Expose original file descriptor in CliRunner: a task in repo2rlenv-pr-runtime (Harbor dataset). Title: CliRunner terminates with io.UnsupportedOperation when using faulthandler

The task

**Title:** `CliRunner` terminates with `io.UnsupportedOperation` when using `faulthandler`

Part of FineEnvs/repo2rlenv-pr-runtime.