The per-entity script list allowed picking the same script class
twice; the name-keyed runtime silently ignores duplicates, leaving
the extra rows dead weight with unusable enable bits. Enforce
DisallowMultipleComponent semantics: the dropdown of each row only
offers unattached names (own name kept for echo), "+ Add Script"
disables when every registered script is attached, and scene loading
dedupes as a safety net for hand-edited files.
atdunbg
7d02d344e5