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.

tests/test_feats.py

@@ -16,11 +16,16 @@ from pf1e_simulator.abilities import (
     MOUNTED_COMBAT,
     POINT_BLANK_SHOT,
 )
+from pf1e_simulator.combat import CombatantState, CombatEngine
+from pf1e_simulator.grid import Grid
 from pf1e_simulator.loaders.combatant import (
     _KNOWN_FEATS,
     _NOOP_FEATS,
     _resolve_feat,
+    load_combatant,
 )
+from pf1e_simulator.map import MapSpec, TerrainType
+from pf1e_simulator.rng import ScriptedRng
 
 PC_FILES = [
     "data/pcs/esha.json",
@@ -100,6 +105,30 @@ def test_spot_check_weapon_focus_pistol() -> None:
     assert any("Pistol" in str(e.weapon_filter) for e in spec.effects)
 
 
+def test_weapon_focus_applies_to_real_tammara_pistols() -> None:
+    # The feat filter "Pistol" must match tammara's real weapon names
+    # ("Braises d'Automne (pistolet ?)", "Adieux du Printemps
+    # (pistolet, masterwork)") via case-insensitive substring matching,
+    # and must NOT match her rapier or alchemist's fire.
+    tammara = load_combatant(Path("data/pcs/tammara.json"))
+    state = CombatantState(
+        combatant=tammara, side="players", pos=(0, 0), hp=tammara.hp_max
+    )
+    legend = {".": TerrainType(type="floor", move_cost=1)}
+    grid = Grid.from_spec(MapSpec(name="t", terrain=tuple([".." for _ in range(2)]), legend=legend))
+    engine = CombatEngine(ScriptedRng([]), grid, [state])
+
+    def attack_total(weapon_name: str | None) -> int:
+        mods = engine._stat_modifiers(state, "attack", weapon_name=weapon_name)
+        return sum(m.value for m in mods if m.weapon_filter is not None)
+
+    assert attack_total("Braises d'Automne (pistolet ?)") == 1
+    assert attack_total("Adieux du Printemps (pistolet, masterwork)") == 1
+    assert attack_total("Rapier (masterwork)") == 0
+    assert attack_total("Alchemist's Fire") == 0
+    assert attack_total(None) == 0
+
+
 def test_spot_check_toughness_level_tied() -> None:
     spec = _resolve_feat("Toughness", 5)
     assert spec.name == "Toughness"