init monlet repo with stage 0-2 (docs, contract, agent MVP)

examples/README.md

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+# Examples
+
+Examples for checks, configs, and local demos.
+
+Stage 0 includes only placeholders.

examples/checks/example_check.sh

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+#!/bin/sh
+echo "ok"
+exit 0

examples/event-batch.json

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+{
+  "agent_id": "host-01.prod",
+  "events": [
+    {
+      "event_id": "018f5b3a-0a3d-7c5b-9a1e-2c4f6a8b0c11",
+      "check_id": "disk_root",
+      "observed_at": "2026-05-26T12:00:05Z",
+      "status": "ok",
+      "exit_code": 0,
+      "duration_ms": 42,
+      "output": "/ 18% used (180G/1.0T)",
+      "output_truncated": false,
+      "notification_owner": "server",
+      "incident_key": "host-01.prod:disk_root"
+    },
+    {
+      "event_id": "018f5b3a-1f7e-7d2a-8b3c-9e1d2f3a4b5c",
+      "check_id": "postgres_up",
+      "observed_at": "2026-05-26T12:00:05Z",
+      "status": "critical",
+      "exit_code": 2,
+      "duration_ms": 1503,
+      "output": "could not connect to server: Connection refused",
+      "output_truncated": false,
+      "notification_owner": "server",
+      "incident_key": "host-01.prod:postgres_up"
+    }
+  ]
+}

examples/heartbeat.json

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+{
+  "agent_id": "host-01.prod",
+  "observed_at": "2026-05-26T12:00:00Z",
+  "hostname": "host-01.prod.example.com",
+  "version": "0.1.0",
+  "mode": "push_only",
+  "labels": {
+    "env": "prod",
+    "region": "eu-central-1",
+    "role": "api"
+  }
+}