Fix M5 signal quality: ATR ordering bug, noise gates, blocked-hour leak (+41R)

ATR was computed after EMAs so ribbon compression detection was dead code
on all timeframes — moved ATR first. Extended M5 swing S/R lookback from
50 to 120 bars. Added four M5-specific filters: min score, MTF agreement,
confirmation TF conviction, and SELL quality cap (A-grade M5 shorts enter
at dip extremes and lose). Fixed backtester blocked-hour check to use bar
close time matching the live bot. Added trade geometry config (spread gate,
SL floor, TP floor RR) and primary_tf mismatch guard in backtester.

Backtest: 1133 trades/+11.5R → 419 trades/+41.0R, PF 1.03→1.37, DD 21→11R.
Train/val split positive in both halves (+19.8R/+21.3R).

config.py

@@ -124,6 +124,20 @@ class SignalConfig:
     # — smaller wins make the fixed spread a larger share of every TP.
     tp_tightening_factor: float = 1.0
 
+    # ── Trade geometry ────────────────────────────────────────────
+    # Round-trip transaction cost estimate in price units (XAU ~$0.30).
+    round_trip_cost: float = 0.30
+    # Spread gate: reject setups whose TP1 distance is below
+    # round_trip_cost × this multiple (caps cost at ~3% of target).
+    # Validated 2026-07: small-target trades lose in both data halves
+    # on M5 while TP≥$10 trades earn ~+0.08R/trade.
+    min_tp_cost_multiple: float = 30.0
+    # Fixed SL floor in pips (80 pips = $8 on XAU). 0 disables — SL then
+    # floors at ATR × v2_sl_atr_multiplier only.
+    min_sl_pips: float = 80.0
+    # TP1 floor as a fraction of SL distance (0.5 = historical RR 0.5).
+    tp_floor_rr: float = 0.5
+
 
 @dataclass
 class NewsConfig:
@@ -166,6 +180,20 @@ class XauStrategyConfig:
     # shorts lose consistently against gold's macro uptrend).
     sell_vol_regimes: List[str] = field(default_factory=lambda: ["high", "extreme"])
 
+    # ── M5-specific filters ──────────────────────────────────────
+    # M5 signals are noisy; require stronger confirmation before
+    # generating trade setups. Without these, M5 is breakeven
+    # (+0.01R/trade) with 21% drawdown.
+    m5_require_mtf: bool = True
+    m5_min_abs_score: float = 30.0
+    m5_min_confirmation_score: float = 10.0
+    # A-grade M5 SELLs enter at the extreme of temporary dips and
+    # lose (-0.017R/trade on 163 trades) — maximum conviction at
+    # the worst entry. Cap SELL quality so A-grade can't trigger
+    # the ATR-based setup generator; B-grade swing setups survive
+    # because they catch moderate drops, not extremes.
+    m5_sell_max_quality: List[str] = field(default_factory=lambda: ["B", "C"])
+
 
 @dataclass
 class FilterConfig: