Add chart-pattern entry archetype (XAU_CP) — disabled by default

Third entry archetype: completion of classical chart patterns (double
bottom/top, H&S top / inverse H&S, bull/bear flag) — the tight canon
with the strongest documented stats. New chart_patterns.py detector
module (pure functions, ATR-unit geometry, closed-bar slices only,
first-close-beyond trigger discipline so a breakout fires exactly
once and never repaints).

Pipeline step 10 in analyze_from_dataframes: fills only empty setup
slots, allows weak-composite F grades (normal at reversal completion)
but inherits session/day blocks, mirrors MTF-opposition + SELL
vol/hour + M5 protections. Geometry: SL = pattern anchor -/+ 0.5 ATR
(min $8), TP1 = measured move, $9 spread gate, trailing exit does the
real work. Strategy tag XAU_CP.

cp_enabled defaults to False everywhere — per-TF adoption happens in
pair_signals/xauusd.py only after the standard validation rule passes.
Backtester: --cp / --cp-patterns flags to test the candidate, XAU_CP
tag recognition.

Suite: 183/183 (21 new tests: detectors, trigger discipline,
invalidation, gates, pipeline, default-off safety).

Claude-Session: https://claude.ai/code/session_015kby7M9JwpYi8NQT2yoxAi

backtest/gpu_backtest.py

@@ -1541,6 +1541,8 @@ def _replay_span(span: Tuple[int, int]):
         first_bear = report.bearish_reasons[0] if report.bearish_reasons else ""
         if "XAU PULLBACK" in first_bull or "XAU PULLBACK" in first_bear:
             tag = "XAU_PB"
+        elif "XAU CHART PATTERN" in first_bull or "XAU CHART PATTERN" in first_bear:
+            tag = "XAU_CP"
         elif "XAU STRATEGY" in first_bull:
             tag = "XAU"
 
@@ -2141,7 +2143,13 @@ def _parse_args(argv: Optional[List[str]] = None) -> argparse.Namespace:
                    help="Override TechnicalConfig.swing_sr_lookback (0 = use config default)")
     p.add_argument("--quality", default="A+,A,B,C", help="Comma-separated allowed grades")
     p.add_argument("--strategies", default="",
-                   help="Comma-separated strategy tags to include (XAU,XAU_PB,GENERIC). Empty = all.")
+                   help="Comma-separated strategy tags to include (XAU,XAU_PB,XAU_CP,GENERIC). Empty = all.")
+    p.add_argument("--cp", action="store_true",
+                   help="Force-enable the chart-pattern entry (XAU_CP) regardless "
+                        "of the factory default — for validating the candidate.")
+    p.add_argument("--cp-patterns", default=None,
+                   help="Comma-separated pattern subset for --cp (e.g. "
+                        "double_bottom,bull_flag). Default: all detectors.")
     p.add_argument("--no-cache", action="store_true", help="Skip parquet cache (force API fetch)")
     p.add_argument("--spread", type=float, default=None,
                    help="Round-trip cost in price units per trade (default: pair's "
@@ -2208,6 +2216,12 @@ def main(argv: Optional[List[str]] = None) -> int:
         )
     if args.swing_sr_lookback > 0:
         platform_cfg.technical.swing_sr_lookback = args.swing_sr_lookback
+    if args.cp:
+        platform_cfg.xau_strategy.cp_enabled = True
+        if args.cp_patterns:
+            platform_cfg.xau_strategy.cp_patterns = [
+                s.strip() for s in args.cp_patterns.split(",") if s.strip()
+            ]
     confirm_tfs = list(platform_cfg.confirmation_timeframes)
 
     end = (