Add feature registry dispatch

blender/osmassets/features.py

@@ -0,0 +1,20 @@
+"""Feature registry and dispatch helpers for scene assembly phases."""
+
+from collections import namedtuple
+
+
+FeatureHandler = namedtuple("FeatureHandler", ("name", "matches", "handle"))
+
+
+def dispatch_ways(ways, projector, handlers):
+    """Dispatch OSM ways to the first matching handler, preserving order."""
+    for way in ways:
+        coords = way["coords"]
+        if not any(projector.inside(c) for c in coords):
+            continue
+        ring = projector.ring(coords)
+        tag = way["tags"]
+        for handler in handlers:
+            if handler.matches(way, tag, ring):
+                handler.handle(way, tag, ring)
+                break