b1_sft_010 replacement verified and approved. I ran it in Node.js and it
returns the correct count (enumerable string + symbol keys counted;
non-enumerable, inherited, and value 0 / false handled correctly).
Now do this:

1. Replace ONLY b1_sft_010 in sft.jsonl with the corrected record.
2. Do not change any other record.
3. Fix the prepare_sft.py category-name mismatch: my pilot uses
   instruction_following, reasoning, coding, hinglish_conversation,
   hindi_conversation, multi_turn_uncertainty, identity — but prepare_sft.py
   expects instruction/english/general. Give me the exact category mapping
   OR the exact code edit so the pilot loads without rejection.
4. Return the final corrected sft.jsonl as a downloadable file, plus a short
   confirmation audit. Do not train.