fix: preserve S-52 multi-light arcs

tools/cm95_s52_style_compiler.py

@@ -179,6 +179,7 @@ USAGE_PRESENCE_FIELDS = (
     *USAGE_VALUE_FIELDS,
     "s52_text_literal",
     "s52_light_label_text",
+    "s52_light_presentations",
     "s52_light_rotation_deg",
     "s52_text1_value",
     "s52_text2_value",
@@ -186,6 +187,20 @@ USAGE_PRESENCE_FIELDS = (
 )
 
 
+def _parse_light_presentations(props: dict[str, Any]) -> list[dict[str, Any]]:
+    raw = props.get("s52_light_presentations")
+    if raw in (None, ""):
+        return []
+    if isinstance(raw, str):
+        try:
+            raw = json.loads(raw)
+        except Exception:
+            return []
+    if not isinstance(raw, list):
+        return []
+    return [dict(item) for item in raw if isinstance(item, dict)]
+
+
 def _scan_pbf_usage(path: Path) -> dict[str, Any]:
     try:
         import mapbox_vector_tile
@@ -251,7 +266,17 @@ def _scan_pbf_usage(path: Path) -> dict[str, Any]:
                 render_kind_counts["TXTE"][placement] += 1
             if props.get("s52_csp_resolved") == "LIGHTS05" and "s52_text_literal" in props:
                 render_kind_counts["LIGHT_TX"][placement] += 1
-            if "s52_arc_color" in props:
+            light_presentations = _parse_light_presentations(props)
+            if light_presentations:
+                for presentation in light_presentations:
+                    nested_placement = (
+                        layer_name,
+                        str(presentation.get("s52_display_priority") or priority),
+                        str(presentation.get("s52_display_category") or category),
+                    )
+                    if presentation.get("s52_arc_color"):
+                        render_kind_counts["RUNTIME_CA"][nested_placement] += 1
+            elif "s52_arc_color" in props:
                 render_kind_counts["RUNTIME_CA"][placement] += 1
             for field in USAGE_PRESENCE_FIELDS:
                 if field not in props: