fix: add label to Report in run_structural_reform endpoint

Author: nikhilwoodruff

src/policyengine_api/api/agent_results.py

@@ -498,6 +498,7 @@ def run_structural_reform(
 
     # Create report
     report = Report(
+        label=f"Structural reform: {policy.name}",
         baseline_simulation_id=baseline_sim.id,
         reform_simulation_id=reform_sim.id,
         status=ReportStatus.PENDING,