Summarise a Calico load as a four-count reconciliation report 🟩

LoadReport.from_calico_load reports loaded observations alongside the three drop
reasons (unmatched-to-portfolio, null-uprn, blank-placeholder) so every Calico
row is accounted for.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

applications/condition/load_report.py

@@ -22,4 +22,10 @@ class LoadReport:
         unmatched_reference_count: int,
         null_uprn_references: List[str],
     ) -> "LoadReport":
-        raise NotImplementedError
+        loaded = sum(len(prop.assets) for prop in properties)
+        return cls(
+            loaded=loaded,
+            unmatched_to_portfolio=unmatched_reference_count,
+            null_uprn=len(null_uprn_references),
+            blank_placeholder=blank_placeholder_count,
+        )