Fix semi open stalls: one-leg asks, OTM realign, clearer pick errors.

Monitor no longer shows ATM Put bias while semi-auto is authorized for Call.

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

backend/tests/test_p1_p2_rules.py

@@ -53,6 +53,17 @@ def test_decide_fixed_short_call() -> None:
     assert s.bias == "fixed_short_call"
 
 
+def test_decide_fixed_needs_only_own_leg() -> None:
+    from app.strategy.signal import decide_fixed
+
+    # 半自动多/空：对侧卖一缺失仍可定方向
+    sc = decide_fixed(8.2, None, perp_side="short")
+    assert sc is not None and sc.option_side == "call"
+    sp = decide_fixed(None, 11.4, perp_side="long")
+    assert sp is not None and sp.option_side == "put"
+    assert decide_fixed(None, None, perp_side="short") is None
+
+
 def test_signal_strike_below_spot_call_short() -> None:
     # 现价 1859、ATM 1850：即使 Put 卖一更高，也走 Call+空
     s = decide(10.0, 20.0, strike=1850, mark_px=1859)