feat(abilities): add passive feats system (Weapon Focus, Iron Will, Dodge, Point-Blank Shot)

src/pf1e_simulator/models.py

@@ -11,6 +11,7 @@ from typing import Literal
 
 from pydantic import BaseModel, ConfigDict, Field, field_validator
 
+from pf1e_simulator.abilities import AbilitySpec  # noqa: TC001
 from pf1e_simulator.dice import DiceExpr, DiceParseError, parse_dice
 
 
@@ -110,3 +111,4 @@ class Combatant(_FrozenModel):
     xp: int | None = None
     source: str = ""
     notes: str = ""
+    features: list[AbilitySpec] = []