docs(work): scaffold dag-and-readiness-v1 epic + stories

docs/work/_state.json

@@ -1,5 +1,5 @@
 {
-  "updated_at": "2026-05-13T05:56:35.878Z",
+  "updated_at": "2026-05-13T05:59:55.392Z",
   "epics": {
     "agent-workflow-docs-v1": {
       "status": "done",
@@ -79,6 +79,30 @@
         }
       }
     },
+    "dag-and-readiness-v1": {
+      "status": "in-progress",
+      "title": "DAG + readiness — depends-on / blocks parsing",
+      "stories": {
+        "01-extended-state": {
+          "status": "in-progress",
+          "title": "Frontmatter array parsing + extended state shape",
+          "ac_total": 4,
+          "ac_completed": 0
+        },
+        "02-dag-computation": {
+          "status": "todo",
+          "title": "DAG computation — ready + blocked story sets",
+          "ac_total": 3,
+          "ac_completed": 0
+        },
+        "03-cli-subcommands": {
+          "status": "todo",
+          "title": "CLI ready / blocked subcommands",
+          "ac_total": 5,
+          "ac_completed": 0
+        }
+      }
+    },
     "frontend-conformance-v1": {
       "status": "done",
       "title": "Frontend conformance rules v1",