Unity build size

Bring a Unity player build under a size limit: measure the thing that is limited, fix the few assets and settings that dominate it, rebuild, and prove the result runs. Targets Unity 6.3 LTS (6000.3); the scripts were exercised against glTFast 6.20.0 projects. Keep an existing project's version from ProjectSettings/ProjectVersion.txt.

Script paths below are relative to this skill's folder. Both scripts are read-only, standard-library Python 3.10+.

1. Pin what is limited

A build has several sizes, and fixing the wrong one wastes the user's time. Find out which file is limited and by how much, then read only the matching reference: