Codex writes informational ERROR messages about ReasoningSummaryDelta
to stderr even on successful execution (exit code 0). The OpenClaw
agent misinterprets this non-empty stderr as a failure.
- Add filterStderrNoise() to strip known codex noise patterns from
stderr when exit code is 0
- Preserve raw stderr in DebugInfo.rawStderr when --debug is active
- Add 5 new tests covering noise filtering, preservation on failure,
debug raw output, and non-codex client passthrough
stefano