Isolate explicit S/R gate target ladder

app/services/backtest_service.py

@@ -100,6 +100,7 @@ STRUCTURAL_OVERLAY_SOURCE_VARIANT = (
 )
 STRUCTURAL_OVERLAY_WEIGHT = 0.05
 STRUCTURAL_OVERLAY_SCORE_KEY = "structural_overlay_95_5_score"
+EXPLICIT_TARGET_LADDER_VARIANT = "explicit_target_ladder"
 RANGE_RESIDUAL_VARIANTS = {
     "rewrite_range504_structural_legacy_primary",
     "rewrite_range504_structural_primary2",
@@ -163,6 +164,7 @@ SR_RESEARCH_VARIANTS = {
     "legacy_traffic_grid_only",
     "legacy_range_grid_touch",
     "legacy_range_grid_neutral",
+    EXPLICIT_TARGET_LADDER_VARIANT,
     STRUCTURAL_OVERLAY_VARIANT,
     *RANGE_FACTOR_VARIANTS,
 }
@@ -216,6 +218,7 @@ def _primary_min_rr_for_variant(sr_variant: str, activation: dict) -> float:
         sr_variant in {
             "production_control",
             "production_range504",
+            EXPLICIT_TARGET_LADDER_VARIANT,
             STRUCTURAL_OVERLAY_VARIANT,
         }
         or sr_variant.endswith("_legacy_primary")
@@ -371,6 +374,14 @@ def _window_setups(
         detected_levels = detect_sr_levels_legacy(
             highs, lows, closes, volumes, include_pivots=False
         )
+    elif sr_variant == EXPLICIT_TARGET_LADDER_VARIANT:
+        detected_levels = detect_sr_levels_legacy(
+            highs,
+            lows,
+            closes,
+            volumes,
+            explicit_range_grid=True,
+        )
     elif sr_variant in {"legacy_range_grid_touch", "legacy_range_grid_neutral"}:
         detected_levels = detect_sr_levels_legacy(
             highs,