Design records

One record per decision, written when it was taken and not edited afterwards except by an amendment. They explain why the code is the way it is; Architecture and the reference pages describe what it does today.

#	Decision	Status
0001	Fixed-point int64 for Price and Qty	accepted
0002	Exceptions and RTTI stay enabled, but off the hot path	accepted
0003	#pragma once instead of include guards	accepted
0004	doctest over GoogleTest	accepted
0005	CPM.cmake over submodules, Conan or vcpkg	accepted
0006	Static libraries with LTO	accepted
0007	A hand-written network stack over Boost.Asio and libwebsockets	accepted
0008	The simulated exchange speaks the Binance protocol	accepted
0009	CRTP strategies over virtual interfaces	accepted
0010	The .fmj journal format	accepted; amended by format versions 2 and 3
0011	scikit-build-core for Python packaging	accepted
0012	Strategy developer experience	accepted; section 7 superseded by 0013
0013	Python strategies in live trading	accepted
0014	US equities	accepted, not implemented: the page is a plan, not the code
0015	UDP multicast market data and kernel-bypass receive	accepted; amends 0014's market-data scope
0016	Pluggable storage backends, SQLite first	accepted