book Directory Reference

Files
	book_syncer.hpp
	BookSyncer: venue-agnostic snapshot/delta synchronisation FSM (5.4), instantiated per instrument on the net thread.
	book_view.hpp
	BookView: the read interface every book implementation (L2Book, L3Book::to_l2 view, sim book) exposes to strategies and risk.
	l2_book.hpp
	L2Book<kMaxDepth>: price-aggregated book for crypto feeds (5.4).