feat(world): generic dive site scene fed by a baked site definition

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

game/world/sonar/reference_bathymetry_acquisition.gd

@@ -68,10 +68,16 @@ func capture(request: SonarCaptureRequest) -> SonarCaptureResult:
 			var material := SonarMaterial.Value.ROCK
 			var reflectivity := 0.72
 			if collider != null:
-				material = int(collider.get_meta("sonar_material", material))
-				reflectivity = float(
-					collider.get_meta("sonar_reflectivity", reflectivity)
-				)
+				if collider.has_method("sonar_material_at"):
+					material = int(collider.call("sonar_material_at", world_position))
+					reflectivity = float(
+						collider.call("sonar_reflectivity_at", world_position)
+					)
+				else:
+					material = int(collider.get_meta("sonar_material", material))
+					reflectivity = float(
+						collider.get_meta("sonar_reflectivity", reflectivity)
+					)
 			var incidence := clampf(absf(world_normal.dot(Vector3.UP)), 0.18, 1.0)
 			var attenuation := lerpf(1.0, 0.55, distance_ratio)
 			var intensity := clampf(incidence * reflectivity * attenuation, 0.0, 1.0)