PF1e (CRB rogue Sneak Attack): "A rogue cannot sneak attack while
striking a creature with total concealment." _sneak_attack_dice now gates
on miss_chance >= 50 instead of any concealment > 0, so a blurred (20%)
target can still be sneak attacked while a displaced (50%) one cannot. The
test that pinned the old any-concealment denial was retargeted to total
concealment and a partial-concealment case added; README updated.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
ctan