Add tools/check-ui-color-sources.py: fails if a hardcoded numeric Color()/Color8()
is applied to a widget in a scene (add_theme_*_override / StyleBox *_color).
Allows computed Color(accent.r,…), transparent, named constants, and var-init
fallbacks; excludes scenes/tests + the 3 precursor deletion files. Passes clean
on live scenes (exit 0). Wired into ./run verify as step 17 so a hardcoded
colour can't creep back in.
Capstone for the override→inheritance / single-colour-system work: colours in
live scenes now provably come from the design-token source.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
