PF1e (CRB Cover): "You can't execute an attack of opportunity against an
opponent with cover relative to you"; (CRB Concealment): the same holds
against total concealment. _resolve_aoo now checks terrain cover
(cover_bonus_cells, melee line) and miss_chance >= 50 before striking,
logs the suppression and leaves the per-round budget unspent. Partial
concealment (blurred 20%) and normal attacks are unaffected.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
