MEDIA_TAG_CLEANUP_RE (and MEDIA_EXTENSIONLESS_TAG_RE) only recognized
ASCII terminators after a MEDIA:<path> tag. Chinese-language agent
output naturally writes MEDIA:D:\...\zhibao.pdf（782.6 KB）or ...pdf：内容 —
the full-width punctuation failed the trailing lookahead and the
attachment was silently dropped (cron even reported 'delivered') (#88038).
Both lookaheads now accept a CJK full-width terminator set (（）〈〉《》：，。；
！？、curly quotes【】) alongside the ASCII set. The #68773 adjacent-tag
splitting guard is covered by a regression test.
8dc427949f