Tune EUR/USD defaults: tighter SL, higher TP, A-grade filter, unblock ranging

Config changes from EUR/USD optimization rounds:
- sl_atr_multiplier 1.5→0.5, tp_atr_multiplier 1.0→1.5, min_rr 0.5→1.0
- Unblock ranging regime, restrict to A+/A quality on M15
- Lower entry thresholds: score 38→30, confidence 60→50
- Add M5-specific regime weights and config overrides in eurusd.py

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config.py

@@ -169,22 +169,22 @@ class EurUsdStrategyConfig:
     weekend_filter: bool = True
     allowed_weekdays: List[int] = field(default_factory=lambda: [0, 1, 2, 3, 4])
     min_atr_threshold: float = 0.0003
-    sl_atr_multiplier: float = 1.5
-    tp_atr_multiplier: float = 1.0
+    sl_atr_multiplier: float = 0.5
+    tp_atr_multiplier: float = 1.5
 
     sl_atr_floor: float = 1.2
-    min_rr_ratio: float = 0.5
+    min_rr_ratio: float = 1.0
     mature_move_threshold: float = 35.0
     tp_quality_scale: Dict[str, float] = field(default_factory=lambda: {
         "A+": 1.0, "A": 1.0, "B": 1.0, "C": 1.0,
     })
-    blocked_regimes: List[str] = field(default_factory=lambda: ["ranging"])
-    min_quality_grades: List[str] = field(default_factory=lambda: ["A+", "A", "B"])
+    blocked_regimes: List[str] = field(default_factory=list)
+    min_quality_grades: List[str] = field(default_factory=lambda: ["A+", "A"])
     max_exhaustion_tags: int = 99
     block_near_ema200: bool = False
     session_hours: List[int] = field(default_factory=list)
-    min_entry_score: float = 38.0
-    min_entry_confidence: float = 60.0
+    min_entry_score: float = 30.0
+    min_entry_confidence: float = 50.0
     block_rsi_extended: bool = True
     be_trigger_r: float = 0.3
     be_buffer_r: float = 0.05