Hardening release: a spec that compiles to no notes is now an error instead of a silent
.fms, same-tick collisions are reported together with the options that resolve them, the
tempo model is documented and reported honestly (FamiStudio C4 is 49, one tick is one
frame, bpm follows from beatLength), and the documentation is split by audience and
mirrored in Simplified Chinese with a markdown lint to keep it that way.