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Windows queue mode still crashes subprocess reader threads with UnicodeDecodeError #12

Description

@MatthiasLew

Regression status

This issue is a follow-up to a previously closed Windows encoding issue.

The problem is still reproducible after updating Koru to commit:

1b37d451

The previous issue appears to have fixed part of the Windows console behavior, but queue-mode subprocess output is still decoded incorrectly.

Summary

Running Koru queue mode on Windows still produces repeated background reader-thread crashes while Koru captures output from Planfile subprocesses.

The LLM ticket itself completes successfully, OpenRouter returns the expected response, and the ticket reaches done. However, every Planfile subprocess produces:

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf3 in position 43: invalid continuation byte

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