- Remove group from Misting/Mistborn/potential/Feruchemy traits that
lacked a level field (CK3 unsets the group and logs errors)
- Add level = 1/2/3 to allomantic strength traits (proper progression)
- Remove inherit_chance and both_parent_has_trait_inherit_chance from
all genetic traits (CK3 1.18 considers this an error)
- Set birth values (0.0-1.0 range) to control inheritance frequency
- Fix doubled icon paths: remove gfx/interface/icons/traits/ prefix
that CK3 auto-prepends, causing double-pathed lookups
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>