Send pushover notifications from AI agent

[
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    "event": "node_start",
    "nodeId": "dd171628-2472-48f5-80e8-1527f16e5ebb",
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  {
    "data": {
      "mode": "read",
      "status": "ok",
      "service": "pushovertool",
      "latencyMs": 250,
      "operation": "run",
      "simulated": true
    },
    "event": "integration_mocked",
    "nodeId": "integration",
    "timestamp": 1780861628053
  },
  {
    "data": {
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    "timestamp": 1780861628053
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  {
    "data": {
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    "timestamp": 1780861628061
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  {
    "data": {
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    },
    "event": "seeded",
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  {
    "data": {
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]