feat: add agentmon monitoring hook for OpenClaw telemetry

Add hook handler that forwards OpenClaw agent events to the agentmon
ingest endpoint for monitoring and observability.

- ansible/playbooks/files/agentmon-hook/: Ansible-deployable hook
- openclaw/hooks/agentmon/: Hook installed in OpenClaw instance

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

openclaw/hooks/agentmon/HOOK.md

@@ -0,0 +1,33 @@
+---
+name: agentmon
+description: "Emit OpenClaw telemetry events to the agentmon monitoring pipeline"
+metadata:
+  openclaw:
+    events:
+      - "command:new"
+      - "command:stop"
+      - "command:reset"
+      - "message:received"
+      - "message:sent"
+      - "agent:bootstrap"
+    export: "default"
+---
+
+# Agentmon Telemetry Hook
+
+Captures OpenClaw agent activity and emits it as `agentmon.event` envelopes to
+the agentmon ingest gateway.
+
+## Configuration
+
+Set the ingest gateway URL before enabling the hook:
+
+```bash
+export AGENTMON_INGEST_URL=http://192.168.122.1:8080
+```
+
+You can optionally override the VM identifier:
+
+```bash
+export AGENTMON_VM_NAME=zap
+```