dump_yaml called yaml.safe_dump without allow_unicode=True, so non-ASCII
content was written as \xNN / \uXXXX escapes instead of literal UTF-8 — a
round-trip readability loss for bundle config. The centralized helper
_utils.dump_frontmatter and the extensions/presets config writers all pass
allow_unicode=True; align dump_yaml with them.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>