fix(rules): Weapon Focus filter matches weapon names case-insensitively (substring)

The filter 'Pistol' now matches 'Braises d'Automne (pistolet ?)' via
case-insensitive substring matching, so the feat is no longer dead.
Golden test_tammara_vs_goblin updated: round-4 pistol shot gains the +1
feat bonus (total 15 -> 16 vs AC 16), turning the MISS into a lethal HIT
(17 damage, goblin 6 -> -11); the goblin dies on round 4 so the old
rounds 4-10 exchange and the draw are gone.

src/pf1e_simulator/combat.py

@@ -307,6 +307,19 @@ def _size_rank(size: str) -> int:
     except ValueError:
         return _SIZE_ORDER.index("medium")
 
+
+def _weapon_filter_matches(weapon_filter: str, weapon_name: str | None) -> bool:
+    """True when a feat's weapon_filter names the weapon being used.
+
+    PF1e Weapon Focus is taken by weapon GROUP ("Pistol"), while sheets name
+    individual weapons ("Braises d'Automne (pistolet ?)"), so the match is a
+    case-insensitive substring test of the filter against the weapon name.
+    A None weapon name (no weapon context) never matches a filtered modifier.
+    """
+    if weapon_name is None:
+        return False
+    return weapon_filter.lower() in weapon_name.lower()
+
 # PF1e natural reach for tall creatures (simplification: no long/quadruped
 # distinction). Tiny, Diminutive and Fine have a natural reach of 0 ft (SRD
 # "Big and Little Creatures in Combat"): "Creatures that take up less than 1
@@ -2568,7 +2581,10 @@ class CombatEngine:
                 m
                 for m in feat.effects
                 if m.target == target
-                and (m.weapon_filter is None or m.weapon_filter == weapon_name)
+                and (
+                    m.weapon_filter is None
+                    or _weapon_filter_matches(m.weapon_filter, weapon_name)
+                )
             )
         # PF1e: prone and helpless (paralyzed/asleep/unconscious) AC
         # adjustments depend on the weapon kind and are applied in