Remediate the 2026-09-03 feature-test findings

shopdb/core/models/asset.py

@@ -256,6 +256,24 @@ class Asset(BaseModel, SoftDeleteMixin, AuditMixin):
         elif hasattr(self, 'measuringtool') and self.measuringtool:
             result['pluginid'] = self.measuringtool.measuringtoolid
 
+        # What this asset OWNS, before any inheritance is merged in below.
+        #
+        # The merge is right for a reader: a detail page, a list and the map all
+        # want the resolved location, whoever it came from. It is wrong for a
+        # FORM, which reads the same payload and cannot tell an owned value
+        # from a derived one - so the PC form pre-selected an inherited
+        # location, the operator saved something else entirely, and the
+        # inherited value was written back as the record's own. The asset then
+        # stopped following its parent, silently, on an edit that never touched
+        # location.
+        #
+        # Always emitted, even when nothing is inherited, so a client can bind
+        # to these without checking whether the merge happened.
+        result['ownlocationid'] = self.locationid
+        result['ownmapx'] = self.mapx
+        result['ownmapy'] = self.mapy
+        result['ownlevelid'] = self.levelid
+
         # Include inherited location if this asset has no location data
         if include_inherited_location:
             inherited = self.get_inherited_location()