docs(work): close sandcastle-subscription-auth-v1 epic

docs/work/_state.json

@@ -1,5 +1,5 @@
 {
-  "updated_at": "2026-05-13T07:27:04.538Z",
+  "updated_at": "2026-05-13T07:32:16.097Z",
   "epics": {
     "agent-workflow-docs-v1": {
       "status": "done",
@@ -383,14 +383,14 @@
       }
     },
     "sandcastle-subscription-auth-v1": {
-      "status": "in-progress",
+      "status": "done",
       "title": "Sandcastle subscription auth as primary flow",
       "stories": {
         "01-subscription-first": {
-          "status": "in-progress",
+          "status": "done",
           "title": "Subscription-first dispatch — mount ~/.claude, install claude CLI, docs",
           "ac_total": 8,
-          "ac_completed": 0,
+          "ac_completed": 8,
           "depends_on": [],
           "blocks": []
         }
@@ -449,12 +449,6 @@
       }
     }
   },
-  "ready": [
-    {
-      "epic": "sandcastle-subscription-auth-v1",
-      "story": "01-subscription-first",
-      "title": "Subscription-first dispatch — mount ~/.claude, install claude CLI, docs"
-    }
-  ],
+  "ready": [],
   "blocked": []
 }