Explicitly convert string chunks to Buffer.from(chunk, 'utf8') before
writing to process.stdout. This fixes UTF-8 mojibake (â instead of ◆/│)
seen in some Bun + terminal combinations (e.g. Ghostty on macOS) where
process.stdout.write(string) doesn't encode as UTF-8 by default.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
