chore(work): finish 04-retention-purge-job

docs/work/_system/_state.json

@@ -1,5 +1,5 @@
 {
-  "updated_at": "2026-05-18T18:46:05.646Z",
+  "updated_at": "2026-05-18T18:58:24.087Z",
   "epics": {
     "binder-wrap-helper": {
       "status": "done",
@@ -178,10 +178,10 @@
           "blocks": []
         },
         "04-retention-purge-job": {
-          "status": "todo",
+          "status": "done",
           "title": "Background retention purge job in core-shared",
           "ac_total": 1,
-          "ac_completed": 0,
+          "ac_completed": 1,
           "depends_on": [
             "01-pii-retention-type-primitives"
           ],
@@ -437,11 +437,6 @@
     }
   },
   "ready": [
-    {
-      "epic": "compliance-manifests-pii-retention-subprocessors",
-      "story": "04-retention-purge-job",
-      "title": "Background retention purge job in core-shared"
-    },
     {
       "epic": "compliance-manifests-pii-retention-subprocessors",
       "story": "05-backfill-template-collections",