fix(rules): any concealment denies sneak attack (SRD rogue: 'a creature with concealment')

tests/test_accuracy_rules.py

@@ -158,26 +158,27 @@ def test_total_concealment_denies_sneak_attack() -> None:
     assert not any("sneak" in line for line in eng._transcript)
 
 
-def test_partial_concealment_still_allows_sneak_attack() -> None:
-    """(A7) a blurred (20%) target CAN be sneak attacked — CRB rogue text is
-    "cannot sneak attack while striking a creature with total concealment",
-    so partial concealment no longer denies the precision damage."""
+def test_partial_concealment_denies_sneak_attack() -> None:
+    """(A7) a blurred (20%) target CANNOT be sneak attacked — SRD rogue text
+    is "A rogue cannot sneak attack while striking a creature with
+    concealment": ANY concealment denies the precision damage (the rogue
+    must see the target well enough to pick out a vital spot)."""
     sneak = _combatant("atk", level=3, features=("Sneak Attack",))
     eng = _engine(
         [sneak, _combatant("tgt")],
         [(0, 0), (0, 1)],
         ["players", "monsters"],
-        [15, 90, 6, 6, 4],
+        [15, 90, 6],
     )
     a, t = eng._states
     _add_condition(t, "flat_footed")
     _add_condition(t, "blurred")
     result = eng.resolve_attack(a, t, a.combatant.attacks[0])
-    # d20=15 hits, d100=90 > 20% lands; 2d6 sneak (6+6=12) + 1d6 weapon (4)
-    # = 16 precision-inclusive damage.
-    assert result.damage == 16
-    assert t.hp == 84
-    assert any("sneak attack" in line and "2d6" in line for line in eng._transcript)
+    # d20=15 hits, d100=90 > 20% lands; sneak denied by the 20% concealment,
+    # so only the 1d6 weapon die (6) lands.
+    assert result.damage == 6
+    assert t.hp == 94
+    assert not any("sneak" in line for line in eng._transcript)
 
 
 def test_concealment_miss_does_not_consume_deed() -> None: