Fix inherited contract handling and document smoke test blockers

src/taetigkeitsnachweis/validator.py

@@ -194,22 +194,31 @@ def validate_sources(
 
     if len(month_matches) == 1:
         month_column = month_matches[0]
+        employee_col = column_index_from_string(allocation_cols["employee_name"])
         contract_col = column_index_from_string(allocation_cols["contract_hours_weekly"])
         project_col = column_index_from_string(allocation_cols["project_key"])
 
+        current_contract_value: float | None = None
+
         for row_idx in range(header_row + 1, allocation_ws.max_row + 1):
+            employee_value = _to_text(allocation_ws.cell(row=row_idx, column=employee_col).value)
+            contract_raw = allocation_ws.cell(row=row_idx, column=contract_col).value
+            parsed_contract = _to_float_or_none(contract_raw)
+
+            if employee_value:
+                current_contract_value = parsed_contract
+
             project_key = _to_text(allocation_ws.cell(row=row_idx, column=project_col).value)
             if not project_key:
                 continue
 
-            contract_value = _to_float_or_none(
-                allocation_ws.cell(row=row_idx, column=contract_col).value
-            )
-            if contract_value is None or contract_value <= 0:
+            if current_contract_value is None or current_contract_value <= 0:
                 issues.append(
                     ValidationIssue(
                         code="INVALID_CONTRACT_HOURS",
-                        message=f"Invalid contract weekly hours at row {row_idx}.",
+                        message=(
+                            f"Invalid inherited contract weekly hours at row {row_idx}."
+                        ),
                         severity="error",
                     )
                 )