infra: repurpose Spirit as autonomous infrastructure ops agent

Spirit now monitors #notifications Matrix room for Prometheus alerts,
auto-investigates issues, takes corrective action (container restarts,
disk cleanup, etc.), and documents incidents in Wiki.js.

Changes:
- Custom spirit-ops Docker image (Docker CLI + SSH + diagnostic tools)
- Docker socket mount for local container management
- SSH keys for remote access to hf-pdocker-02 and bart
- Wiki.js API integration for incident documentation
- Prometheus probe for Spirit gateway health
- Safety guardrails: protected services, rate limiting, escalation

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

stacks/monitoring/prometheus.yml

@@ -69,6 +69,8 @@ scrape_configs:
         - http://192.168.86.192:3001        # Grafana
         - http://192.168.86.192:9095        # Prometheus
         - http://192.168.86.192:9093        # Alertmanager
+        - http://192.168.86.192:18815       # Travis (NemoClaw agent)
+        - http://192.168.86.192:18795       # Spirit (infra ops agent)
     relabel_configs:
       - source_labels: [__address__]
         target_label: __param_target