feat(audit): retain rolling phase0 prune reports

src/audit/phase0BaselineArtifactRetention.ts

@@ -3,7 +3,8 @@ export type Phase0RollingArtifactFamily =
   | 'gateway'
   | 'backend_pi_embedded'
   | 'backend_native'
-  | 'backend_drift';
+  | 'backend_drift'
+  | 'prune';
 
 export interface Phase0RollingArtifactFile {
   file_name: string;
@@ -46,6 +47,10 @@ const FAMILY_PATTERNS: Array<{ family: Phase0RollingArtifactFamily; pattern: Reg
     family: 'backend_drift',
     pattern: /^phase0_baseline_live_backend_drift_(\d{4}-\d{2}-\d{2}-\d{6})\.(json|md)$/,
   },
+  {
+    family: 'prune',
+    pattern: /^phase0_baseline_live_prune_(\d{4}-\d{2}-\d{2}-\d{6})\.(json|md)$/,
+  },
 ];
 
 function parseRollingTagTimestampMs(tag: string): number | undefined {