feat(rules): add alignment field to Combatant with axis gating flags

Adds the PF1e two-axis alignment code (LG/NG/CG/LN/N/CN/LE/NE/CE,
default N) to the Combatant model with a strict validator, derived
is_lawful/is_chaotic/is_good/is_evil properties, exposure in the
observation snapshot, and alignment values for all monsters and PCs
sourced from the bestiary KB and the Foundry sheets.

src/pf1e_simulator/combat.py

@@ -1647,6 +1647,7 @@ class CombatEngine:
             "size": state.combatant.size,
             "natural_reach_ft": _SIZE_NATURAL_REACH_FT.get(state.combatant.size, 5),
             "aware": state.combatant.aware,
+            "alignment": state.combatant.alignment,
             "creature_type": state.combatant.creature_type,
             "bab": state.combatant.bab,
             "initiative_mod": state.combatant.initiative_mod,