Add M5 pullback entry archetype (XAU_PB): +140R combined on 12mo

Second entry pattern alongside the Keltner-breakout: enter on the
retrace to EMA21/KC-mid in an established trend (EMA >=3/4 aligned,
ADX>=20, retrace 0.8-6.0 ATR, resumption bar closed back in trend
direction, RSI in the pullback zone not the extended zone). Detector
lives in the aggregator so live and GPU-backtest paths share one
implementation. Own gates (composite floor 15, confirmation-TF
agreement, MTF opposition, vol regimes) with a diagnostic funnel.

PB stops anchor to the pullback swing (~$8 vs ~$25 breakout), so PB
trades get their own trail arm (0.8R vs 0.6R global) via per-trade
trail overrides in the backtester and strategy-aware Telegram alerts.

12mo M5 validation: PB alone +38.3R/254 trades, positive both halves
and all four full quarters; core breakout trades undisturbed
(+101.9R vs +105.0 baseline). Combined book: 549 trades (~10.6/wk),
+140.1R, PF 1.78, DD 11.3R vs 311 trades/+105.0R before.

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

config.py

@@ -148,6 +148,11 @@ class SignalConfig:
     # Set trail_arm_r = 0 to disable and exit at TP1 as before.
     trail_arm_r: float = 0.6
     trail_dist_r: float = 0.75
+    # Pullback (XAU_PB) trades run tighter stops (~$8 vs ~$25), so the
+    # global 0.6R arm fires on noise. Arm later; whole 0.8-arm row of
+    # the grid is +35-38R vs +32R at global params (balanced halves).
+    pb_trail_arm_r: float = 0.8
+    pb_trail_dist_r: float = 0.75
 
 
 @dataclass
@@ -213,6 +218,28 @@ class XauStrategyConfig:
     # halves of 6mo and 12mo backtests).
     m5_sell_min_rsi: float = 25.0
 
+    # ── M5 pullback entry (XAU_PB — see PULLBACK_ENTRY_PLAN.txt) ──
+    # Second entry archetype: enter on the retrace to EMA21/KC-mid in
+    # an established trend instead of at Keltner-breakout extension.
+    # Validated 2026-07: +38.3R/254 trades on 12mo, positive both
+    # halves and all four full quarters, core trades undisturbed.
+    m5_pullback_enabled: bool = True
+    # Composite score is weaker mid-pullback BY DESIGN (price sits
+    # below the momentum bands) — separate, lower floor than Gate 1.
+    m5_pullback_min_score: float = 15.0
+    m5_pullback_adx_min: float = 20.0
+    # RSI must be in the pullback zone, NOT the extended zone the
+    # breakout entries fire in (those run 65-80).
+    m5_pullback_rsi_buy: tuple = (35.0, 62.0)
+    m5_pullback_rsi_sell: tuple = (38.0, 65.0)
+    # Retrace depth from the pre-pullback swing extreme, in ATRs.
+    # Shallower = still extended; deeper = trend likely broken.
+    # M5 gold trend legs measure 3-4 ATR swing-to-trough (median 3.9),
+    # so the ceiling sits well above that of higher TFs.
+    m5_pullback_retrace_atr: tuple = (0.8, 6.0)
+    # Price must have touched EMA21/KC-mid within this many bars.
+    m5_pullback_touch_bars: int = 3
+
 
 @dataclass
 class FilterConfig: