simplified-to-traditional

Convert a Simplified-Chinese article in ai-thoughts/docs/ into its Traditional-Chinese twin, and keep the two in sync. The Simplified article is the source of truth and lives as <YYMMDD-slug>-zh-hans.md; the Traditional twin is generated to <YYMMDD-slug>-zh-hant.md with OpenCC (s2twp) plus a permanent cross-link. Use when the user asks to make, sync, or update the Traditional (繁體) version of a Chinese article — "convert to traditional", "做繁體版", "同步繁简", "zh-hant", "繁體". Never runs automatically; acts only on an explicitly named article. Future articles only — do NOT backfill existing files unless the user explicitly orders it.