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>

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) ───────────