docs(work): close walking-skeleton story 03 (workspaces feature)

docs/work/_system/_state.json

@@ -1,5 +1,5 @@
 {
-  "updated_at": "2026-07-12T20:24:38.709Z",
+  "updated_at": "2026-07-12T20:37:41.771Z",
   "epics": {
     "platform-retrofit": {
       "status": "done",
@@ -131,10 +131,10 @@
           ]
         },
         "03-workspaces-feature-core": {
-          "status": "todo",
+          "status": "done",
           "title": "workspaces feature core — connect, status, list + encrypted credential storage",
           "ac_total": 4,
-          "ac_completed": 0,
+          "ac_completed": 4,
           "depends_on": [],
           "blocks": []
         },
@@ -236,11 +236,6 @@
     }
   },
   "ready": [
-    {
-      "epic": "walking-skeleton",
-      "story": "03-workspaces-feature-core",
-      "title": "workspaces feature core — connect, status, list + encrypted credential storage"
-    },
     {
       "epic": "walking-skeleton",
       "story": "04-runner-app-protocol-clone-install",
@@ -271,7 +266,6 @@
       "story": "06-runner-provisioner-port",
       "title": "IRunnerProvisioner port + local-process and single-host Docker implementations",
       "waiting_on": [
-        "walking-skeleton/03-workspaces-feature-core",
         "walking-skeleton/04-runner-app-protocol-clone-install"
       ]
     },