fix(rules): treat a blinded attacker as facing total concealment

CRB 'Conditions - Blinded': 'All opponents are considered to have total concealment (50% miss chance) against the blinded character.' The sneak-attack gate and the AoO suppression gate now apply the same max(target_concealment, 50) convention as _resolve_hit_damage: a blinded attacker cannot sneak attack and its AoOs are suppressed without spending the budget.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

README.md

@@ -901,7 +901,13 @@ Règles modélisées :
    adversaires comme ayant un concealment total — le même jet unique de d100 est
    tiré avec `miss_chance = max(concealment de la cible, 50)` et journalisé
    « attacker blinded » ; l'attaque peut donc rater même contre une cible sans
-  concealment.
+   concealment. Conformance L2 (CRB « Conditions — Blinded » : « All opponents
+   are considered to have total concealment (50% miss chance) against the
+   blinded character ») : la même convention `max(cible, 50)` s'applique aux
+   deux autres portes de concealment de l'attaquant — l'attaque sournoise est
+   **impossible** pour un aveugle (dissimulation totale) et ses attaques
+   d'opportunité sont **supprimées** contre toute cible (`suppressed (total
+   concealment)`, budget d'AoO non consommé).
 - Attaquant invisible (V5a) : un attaquant portant `invisible` gagne **+2 à ses
   jets d'attaque et de confirmation de critique** et sa cible **perd son bonus
   de Dextérité à la CA** (même chemin `denies_dex_to_ac` que flat-footed/course).

src/pf1e_simulator/combat.py

@@ -2618,12 +2618,20 @@ class CombatEngine:
         30 ft); dice = (level + 1) // 2. Only TOTAL concealment (miss chance
         >= 50%) denies the sneak attack; partial concealment (blurred 20%)
         does not (CRB rogue "Sneak Attack": "cannot sneak attack while
-        striking a creature with total concealment"). PF1e (CRB): undead and
+        striking a creature with total concealment"). A BLINDED attacker faces
-        constructs are immune to precision damage — ooze/plant immunity is not
+        total concealment against ALL its opponents (CRB "Conditions —
-        modeled (no such creature types exist in the data model).
+        Blinded": "All opponents are considered to have total concealment
+        (50% miss chance) against the blinded character"), so it cannot sneak
+        attack either — same max(target, 50) convention as _resolve_hit_damage.
+        PF1e (CRB): undead and constructs are immune to precision damage —
+        ooze/plant immunity is not modeled (no such creature types exist in
+        the data model).
         """
+        effective_concealment = concealment
+        if self._has_condition_named(attacker, "blinded"):
+            effective_concealment = max(concealment, _TOTAL_CONCEALMENT_PCT)
         if (
-            concealment >= _TOTAL_CONCEALMENT_PCT
+            effective_concealment >= _TOTAL_CONCEALMENT_PCT
             or not self._has_feat(attacker, _SNEAK_ATTACK_FEATURE)
         ):
             return 0
@@ -3082,10 +3090,17 @@ class CombatEngine:
         PF1e (CRB "Cover"): "You can't execute an attack of opportunity
         against an opponent with cover relative to you"; (CRB "Concealment"):
         "You can't execute an attack of opportunity against an opponent with
-        total concealment" (miss chance >= 50%). Melee line: terrain cover
+        total concealment" (miss chance >= 50%). A BLINDED attacker considers
-        only — creatures grant no melee cover.
+        ALL its opponents to have total concealment (CRB "Conditions —
+        Blinded": "All opponents are considered to have total concealment
+        (50% miss chance) against the blinded character"), so its AoOs are
+        suppressed too. Melee line: terrain cover only — creatures grant no
+        melee cover.
         """
-        if self._concealment_chance(target) >= _TOTAL_CONCEALMENT_PCT:
+        concealment = self._concealment_chance(target)
+        if self._has_condition_named(attacker, "blinded"):
+            concealment = max(concealment, _TOTAL_CONCEALMENT_PCT)
+        if concealment >= _TOTAL_CONCEALMENT_PCT:
             return "total concealment"
         if cover_bonus_cells(
             self._grid,

tests/test_aoo_defense.py

@@ -78,6 +78,29 @@ def test_aoo_suppressed_vs_total_concealment() -> None:
     )
 
 
+def test_aoo_suppressed_when_attacker_is_blinded() -> None:
+    """Given: the guard is blinded and the runner has no concealment
+    When: the guard resolves the AoO
+    Then: it is suppressed — a blinded character's opponents all have total
+    concealment (CRB Conditions — Blinded) — no die, no budget spent."""
+    runner = make_combatant("runner", hp=20, ac=12)
+    guard = make_combatant("guard", hp=20, ac=15, attack_bonus=5)
+    states = [
+        make_state(runner, "players", (2, 1)),
+        make_state(guard, "monsters", (2, 0)),
+    ]
+    engine = CombatEngine(ScriptedRng([15, 3]), _grid(("....", "....")), states)
+    runner_s, guard_s = engine._states
+    _add_condition(guard_s, "blinded")
+    assert engine._resolve_aoo(guard_s, runner_s) is False
+    assert engine._aoo_used.get("guard", 0) == 0
+    assert len(engine._rng._queue) == 2
+    assert runner_s.hp == 20
+    assert any(
+        "suppressed (total concealment)" in line for line in engine._transcript
+    )
+
+
 def test_aoo_still_strikes_in_the_open() -> None:
     """Given: no cover and no concealment between guard and runner
     When: the guard resolves the AoO

tests/test_conditions_blinded_invisible.py

@@ -81,6 +81,50 @@ def test_blinded_attacker_d100_rolls_once_with_target_concealment() -> None:
     assert any("50%" in line for line in eng._transcript)
 
 
+def test_blinded_attacker_cannot_sneak_attack() -> None:
+    # PF1e (CRB Conditions — Blinded): "All opponents are considered to have
+    # total concealment (50% miss chance) against the blinded character" — and
+    # total concealment denies sneak attack (CRB rogue "Sneak Attack").
+    eng = _engine(
+        [
+            _combatant("atk", features=("Sneak Attack",)),
+            _combatant("tgt"),
+        ],
+        [(0, 0), (0, 1)],
+        ["players", "monsters"],
+        [15, 51, 4],
+    )
+    a, t = eng._states
+    _add_condition(a, "blinded")
+    _add_condition(t, "flat_footed")
+    result = eng.resolve_attack(a, t, a.combatant.attacks[0])
+    # d20 15 + 5 = 20 hits; blinded d100 51 > 50 lands; base 1d6 = 4 only —
+    # no sneak d6 is rolled despite the target being denied its Dex bonus.
+    assert result.hit is True
+    assert result.damage == 4
+    assert not any("sneak" in line for line in eng._transcript)
+
+
+def test_sighted_sneak_attack_control_when_not_blinded() -> None:
+    eng = _engine(
+        [
+            _combatant("atk", features=("Sneak Attack",)),
+            _combatant("tgt"),
+        ],
+        [(0, 0), (0, 1)],
+        ["players", "monsters"],
+        [15, 3, 4],
+    )
+    a, t = eng._states
+    _add_condition(t, "flat_footed")
+    result = eng.resolve_attack(a, t, a.combatant.attacks[0])
+    # Same swing without blinded: sneak applies (d20 15 hits, sneak d6 3,
+    # base d6 4 -> 7 total).
+    assert result.hit is True
+    assert result.damage == 7
+    assert any("sneak attack" in line for line in eng._transcript)
+
+
 # ── Rule B: invisible attacker (+2 to hit, target loses Dex to AC) ───────────