modified: netbox_services/engine/__init__.py

modified:   netbox_services/engine/allocators.py
modified:   netbox_services/engine/context.py
new file:   netbox_services/engine/mappers.py
modified:   netbox_services/engine/resolver.py
new file:   netbox_services/engine/templating.py
modified:   netbox_services/forms.py
modified:   netbox_services/models.py
modified:   netbox_services/tests/test_allocators.py
new file:   netbox_services/tests/test_mappers.py
modified:   netbox_services/tests/test_resolver.py
new file:   netbox_services/tests/test_templating.py
Simplify layout to template and service instances

netbox_services/engine/context.py

@@ -1,22 +1,29 @@
-"""Resolution context — carries service and parent references during tree walk."""
+"""Resolution context — carries service and ancestor chain during tree walk."""
 
 
 class Context:
     """Evaluation frame for the resolver.
 
-    Top-level context has ``service`` set and ``parent_object`` as None.
+    Top-level context has ``service`` set, ``parent_object`` as None,
+    and ``ancestors`` as an empty list.
+
     Each selected/allocated object pushes a child context so children
-    can reference ``parent`` and traverse its relations.
+    can reference ``parent`` (immediate) and ``ancestors`` (full chain).
+
+    ``ancestors[0]`` is the immediate parent (``p1`` in Jinja2),
+    ``ancestors[1]`` is the grandparent (``p2``), etc.
     """
 
-    def __init__(self, service, parent_object=None):
+    def __init__(self, service, parent_object=None, ancestors=None):
         self.service = service
         self.parent_object = parent_object
+        self.ancestors = ancestors if ancestors is not None else []
 
     def child(self, obj):
         return Context(
             service=self.service,
             parent_object=obj,
+            ancestors=[obj] + self.ancestors,
         )
 
     @property