generated-scene: add scheduled monitoring runtime and helper lifecycle hardening

tests/fixtures/generated_scene/family_expansion_policy.json

@@ -0,0 +1,80 @@
+{
+  "policyVersion": "2026-04-18",
+  "scope": "roadmap-plan-track-e",
+  "mainlineGroups": [
+    {
+      "group": "G1",
+      "policy": "mainline",
+      "executionRule": "build reusable single-request template and validate representative migrations first",
+      "acceptanceFocus": [
+        "request/response/normalize restored",
+        "single_request_table compile path stable",
+        "family-level reuse confirmed"
+      ]
+    },
+    {
+      "group": "G2",
+      "policy": "mainline",
+      "executionRule": "deepen multi-mode semantic recovery before broad expansion",
+      "acceptanceFocus": [
+        "mode matrix restored",
+        "mode-specific request/response contract restored",
+        "bootstrap business context stable"
+      ]
+    },
+    {
+      "group": "G3",
+      "policy": "mainline",
+      "executionRule": "prioritize fail-closed and host-runtime separation before expansion",
+      "acceptanceFocus": [
+        "pagination chain restored",
+        "secondary request chain restored",
+        "localhost host-runtime evidence separated from business bootstrap"
+      ]
+    }
+  ],
+  "boundaryGroups": [
+    {
+      "group": "G6",
+      "policy": "boundary-runtime",
+      "executionRule": "treat as independent family with explicit host-bridge runtime contract; do not fold back into G1/G1-E/G3",
+      "acceptanceFocus": [
+        "host bridge action evidence restored",
+        "callback request chain present",
+        "incomplete manual scene IR stays fail-closed"
+      ]
+    },
+    {
+      "group": "G7",
+      "policy": "boundary-runtime",
+      "executionRule": "treat as independent family with multi-endpoint aggregation contract; do not fold back into G1/G1-E",
+      "acceptanceFocus": [
+        "inventory endpoint set restored",
+        "inventory aggregate step present",
+        "incomplete manual scene IR stays fail-closed"
+      ]
+    },
+    {
+      "group": "G8",
+      "policy": "boundary-runtime",
+      "executionRule": "treat as independent family with local pipeline contract; do not collapse into G6 host bridge workflow",
+      "acceptanceFocus": [
+        "localhost pipeline dependencies restored",
+        "sql/doc export steps present",
+        "incomplete manual scene IR stays fail-closed"
+      ]
+    }
+  ],
+  "deferredGroups": [
+    {
+      "group": "G4",
+      "policy": "deferred",
+      "executionRule": "keep extension entry only; do not consume current mainline capacity"
+    },
+    {
+      "group": "G5",
+      "policy": "degraded",
+      "executionRule": "default fail-closed or analysis-only; do not pollute mainline archetypes"
+    }
+  ]
+}