Separate chart S/R from gate target ladder

tests/unit/test_detect_sr_levels.py

@@ -11,6 +11,7 @@ from app.services.sr_service import (
     _merge_levels,
     _round_number_candidates,
     _strength_from_respects,
+    detect_gate_target_ladder,
     detect_sr_levels,
     detect_sr_levels_legacy,
 )
@@ -301,6 +302,18 @@ class TestDetectSrLevels:
         assert any("range_grid" in level["sources"] for level in explicit)
         assert all("volume_profile" not in level["sources"] for level in explicit)
 
+    def test_gate_target_ladder_is_the_explicit_volume_free_detector(self):
+        highs, lows, closes, volumes = _make_series(n=500)
+        expected = detect_sr_levels_legacy(
+            highs,
+            lows,
+            closes,
+            volumes,
+            explicit_range_grid=True,
+        )
+
+        assert detect_gate_target_ladder(highs, lows, closes) == expected
+
     def test_explicit_range_grid_is_volume_independent(self):
         highs, lows, closes, volumes = _make_series(n=500)
         shifted_volumes = [volume * (i + 1) for i, volume in enumerate(volumes)]