Fix live monitoring scrape coverage

[Svaag]

Summary

• add the loop VM node_exporter target to the mon Prometheus scrape config so Prometheus-backed Icinga checks for loop resolve data
• correct the internal Vault blackbox probe to use Vault's plain-HTTP internal listener and refresh the blackbox module comment
• expose real Vector internal metrics on log via an internal_metrics source plus prometheus_exporter sink on :8686, and correct the Vector buffer alert metric name for Vector 0.55.0
• disable netproxy Prometheus scrape targets because netproxy is intentionally not live yet; tracked in Complete live rollout of x402 Hyrule Network Proxy #214
• refresh the generated log Vector artifact and network-flow docs

Live triage/remediation performed

• copied current mon Prometheus/blackbox configs to mon and reloaded Prometheus/restarted blackbox exporter
• applied the logs aggregator role on log to expose Vector Prometheus metrics on :8686
• loop Prometheus-backed Icinga checks recovered: node-up, disk, engineering-loop-timer, knowledge-mcp-service are OK
• Vector and internal Vault Prometheus probes recovered
• disabled netproxy node_exporter/sidecar Prometheus targets live; active Prometheus targets now report no down targets
• added triage notes to network-operations#214: Complete live rollout of x402 Hyrule Network Proxy #214 (comment)

Validation

• scripts/ci/render-all.sh
• scripts/ci/deploy-preflight.sh --repo-only
• remote vector validate --config-toml on the rendered aggregator config
• promtool check config /etc/prometheus/prometheus.yml on mon
• Vector /metrics returns Prometheus samples including vector_buffer_byte_size
• Prometheus active target check on mon: 55 active targets, 0 down active targets
• Prometheus up == 0 returns empty

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