* fix(process): report actual UTF-8 byte count in stdin write message
Replace string.length (UTF-16 code units) with Buffer.byteLength(content, 'utf8')
so the reported byte count matches the actual bytes written to process stdin.
For ASCII content the values are identical. For non-ASCII content (CJK, emoji),
string.length underreports the actual UTF-8 byte count.
* test(process): cover UTF-8 stdin write byte count
Co-authored-by: 陈志强0668000989 <chen.zhiqiang1@xydigit.com>
* style(test): keep UTF-8 regression compact
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Co-authored-by: Peter Steinberger <steipete@gmail.com>
6da7868158