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Retain a 64 KiB diagnostic prefix while counting and draining the complete stderr stream. Report truncation and avoid manufacturing a replacement character at a truncated UTF-8 boundary. Validation: all nine doctor tests pass, including real noisy child, malformed bytes, canonical catalog and startup deadline controls. Based on #3121. Co-authored-by: 1052326311 <65798732+1052326311@users.noreply.github.com>