[feizheng10]

Summary

The kernel-bottleneck Windows behavioral job on amd/skills#285 crashed in the skillscope launcher (bootstrap/launch.py, main, sys.stdout.write). The console encoding is cp1252, and child output decoded with errors="replace" can contain U+FFFD. Writing that character raised UnicodeEncodeError: 'charmap' codec can't encode character '\ufffd' and aborted the action.

At process startup the launcher now reconfigures sys.stdout and sys.stderr to UTF-8 with errors="replace" when the streams support reconfigure. A missing stream, a redirect that cannot be reconfigured, or an OSError / ValueError does not crash startup. Eval logic, skill content, runner selection, and rocprof-compute behavior are unchanged.

Test plan

• python -m unittest tests.test_skillscope.TestActionLauncher — relaying U+FFFD through a cp1252-like stdout does not raise UnicodeEncodeError, and setup survives a missing, closed, or non-reconfigurable stream
• python -m unittest discover -s tests -t . — 507 tests, OK
• Re-run the Windows kernel-bottleneck behavioral job (Federate the six rocprof-compute skills skills#285) and confirm the launcher stays up when a line contains U+FFFD

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