Isolate legacy range-grid features

tests/unit/test_detect_sr_levels.py

@@ -6,6 +6,8 @@ from app.services.sr_service import (
     MAX_LEVELS,
     _bar_respect_weight,
     _cap_levels,
+    _legacy_range_grid_nodes,
+    _legacy_volume_profile_nodes,
     _merge_levels,
     _round_number_candidates,
     _strength_from_respects,
@@ -267,3 +269,65 @@ class TestDetectSrLevels:
         assert pivots and traffic
         assert all(level["sources"] == ["pivot_point"] for level in pivots)
         assert all(level["sources"] == ["volume_profile"] for level in traffic)
+
+    def test_legacy_profile_union_matches_explicit_range_grid(self):
+        highs, lows, closes, volumes = _make_series(n=500)
+        deployed = _legacy_volume_profile_nodes(highs, lows, closes, volumes)
+        explicit = _legacy_range_grid_nodes(highs, lows, closes)
+        assert sorted(deployed) == explicit
+        assert len(explicit) == 20
+
+    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)]
+        baseline = detect_sr_levels_legacy(
+            highs,
+            lows,
+            closes,
+            volumes,
+            include_pivots=False,
+            explicit_range_grid=True,
+        )
+        shifted = detect_sr_levels_legacy(
+            highs,
+            lows,
+            closes,
+            shifted_volumes,
+            include_pivots=False,
+            explicit_range_grid=True,
+        )
+        assert shifted == baseline
+
+    def test_explicit_range_grid_neutral_changes_only_strength(self):
+        highs, lows, closes, volumes = _make_series(n=500)
+        touch = detect_sr_levels_legacy(
+            highs,
+            lows,
+            closes,
+            volumes,
+            include_pivots=False,
+            explicit_range_grid=True,
+        )
+        neutral = detect_sr_levels_legacy(
+            highs,
+            lows,
+            closes,
+            volumes,
+            include_pivots=False,
+            neutral_strength=True,
+            explicit_range_grid=True,
+        )
+        touch_by_price = {level["price_level"]: level for level in touch}
+        neutral_by_price = {level["price_level"]: level for level in neutral}
+        assert neutral_by_price.keys() == touch_by_price.keys()
+        for price, neutral_level in neutral_by_price.items():
+            assert neutral_level["strength"] == 50
+            assert {
+                key: value
+                for key, value in neutral_level.items()
+                if key != "strength"
+            } == {
+                key: value
+                for key, value in touch_by_price[price].items()
+                if key != "strength"
+            }