Root cause: dr-translator was trying to write entire final_zh.md in one
write call, hitting Sonnet 4-6 output token limit for long reports
(~19k English words → ~27k Chinese chars → blown past 32k token cap).
Fix: explicit chunk-and-append protocol
- Split final_en.md by H1 (# ) then H2 (## ) boundaries
- Each chunk ≤ 2,500 English words
- First chunk uses write to create final_zh.md
- Subsequent chunks use edit or read+write to append
- Per-chunk Chinese output kept under ~5,000 characters (safe margin)
- Preserves glossary.json updates across chunks
