Package theme exposes the canonical corrupted-theme color palette, embedded
from colors.json. The JSON is synced from the corrupted-theme repo
(src/data/colors.json) via `make sync-theme` so celeste-cli's corruption
colors stay in lockstep with the theme instead of drifting from hardcoded
hex literals (task 7aa133c9; the #49 color-drift fix is the motivation).