ludic/changes/numbers-float.md

bump: minor type: feat numbers float — a module whose decimal literals are float. A bare 1.5 is fixed unless a float is in sight, which is the right default for deterministic code and the wrong one for a renderer or a game whose numbers are all IEEE: Math.sqrt(2.0) came out in fixed, and every literal needed a float(...) round it. A file that says numbers float (at the top, or inside a program block) gets float literals, and passes the mode on to every non-runtime file it imports, so one line in a barrel or an entry file covers a whole package. Runtime files under runtime/ are never switched, so the engine's own fixed-point code keeps its meaning.