Reverse of the existing make-vs-buy tree: given a ticker, find every
recipe that consumes it as an input, with each output's live market
depth. Answers "is there a deeper downstream product worth chaining
into" without an ad-hoc fio.recipes() scan each time (did this by hand
for BOR, BSE and BBH this session).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>