Align emergency option close to OKX: use bid only, never mark.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_p1_p2_rules.py

@@ -214,14 +214,14 @@ def test_option_intrinsic_and_close_bid_floor() -> None:
     assert settled.notional == 44.0
     assert abs(settled.fee - 44.0 * 0.0005) < 1e-12
 
-    # 紧急垃圾买一 0.2，内在价值 22 → 抬到 22
+    # 紧急：对齐 OKX 市价卖，只按买一（垃圾买一不抬到内在价值/标记）
     assert (
         resolve_option_close_bid(
-            bid=0.2, mark=0.2, intrinsic=22.0, bypass_liquidity=True
+            bid=0.2, mark=22.0, intrinsic=22.0, bypass_liquidity=True
         )
-        == 22.0
+        == 0.2
     )
-    # 常规也有内在价值地板
+    # 常规：内在价值地板
     assert (
         resolve_option_close_bid(
             bid=0.2, mark=0.2, intrinsic=22.0, bypass_liquidity=False
@@ -235,10 +235,10 @@ def test_option_intrinsic_and_close_bid_floor() -> None:
         )
         == 25.0
     )
-    # bypass 无买一，用标记与内在价值
+    # 紧急无买一 → 无法定价（不能用标记）
     assert (
         resolve_option_close_bid(
             bid=None, mark=3.0, intrinsic=22.0, bypass_liquidity=True
         )
-        == 22.0
+        is None
     )