fix(BUG-C1): add BenamiInvestigator class wrapper

ai/investigators/benami_investigator.py

@@ -61,3 +61,15 @@ class BenamiInvestigator:
                     session=None, driver=None) -> dict:
         return investigate(entity_id, entity_name,
                            session=session, driver=driver)
+
+
+# BUG-C1 FIX: class wrapper to match __init__.py import expectation
+class BenamiInvestigator:
+    NAME   = NAME
+    FOCUS  = FOCUS
+    WEIGHT = WEIGHT
+
+    def investigate(self, entity_id: str, entity_name: str,
+                    session=None, driver=None) -> dict:
+        return investigate(entity_id, entity_name,
+                           session=session, driver=driver)