Optimize EUR/USD M5 signals: 1:1 RR, vol/agreement filters, disable XAU

Tune EUR/USD M5 trade setup for balanced profitability (78% WR, 1.68 PF,
+26.5R over 365d) under a 4-hour max hold constraint. Key changes:
- Raise min RR from 0.5 to 1.0 and TP multiplier from 1.0x to 1.2x ATR
- Tighten SL floor (0.8→0.7 ATR) and swing lookback (50→20 bars)
- Add volatility regime filter (block "high" vol) and min 6 indicator
  agreement gate in signal_aggregator
- Raise BE trigger 0.2→0.3R, buffer 0.05→0.15R to let winners run
- Block weak hours (06, 09, 11 UTC) on M5
- Disable XAU strategy checks by default; XAU pair config re-enables

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

config.py

@@ -142,7 +142,7 @@ class XauStrategyConfig:
     Legacy gates (H4 RSI, H1 MACD, M15 score) removed in favor of
     new momentum indicators (ROC, Keltner squeeze, ADX slope).
     """
-    enabled: bool = True
+    enabled: bool = False
     rsi_entry_threshold: float = 45.0
     tp_atr_multiplier: float = 1.0
     sl_atr_multiplier: float = 2.0
@@ -172,10 +172,10 @@ class EurUsdStrategyConfig:
     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
+    tp_atr_multiplier: float = 1.2
 
     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,
@@ -188,8 +188,10 @@ class EurUsdStrategyConfig:
     min_entry_score: float = 38.0
     min_entry_confidence: float = 60.0
     block_rsi_extended: bool = True
-    be_trigger_r: float = 0.2
-    be_buffer_r: float = 0.05
+    blocked_vol_regimes: List[str] = field(default_factory=list)
+    min_indicator_agreement: int = 0
+    be_trigger_r: float = 0.3
+    be_buffer_r: float = 0.15
 
 
 @dataclass