docs: fix Mermaid labels for GitHub parser compatibility

docs/network.md

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+# Network and Exposure View (Prometheus Observed)
+
+## Overview
+
+This document is generated from Prometheus scrape metadata and endpoint URLs. It is an observed monitoring view and not a physical network map.
+
+- Inventory timestamp: `2026-04-13T06:36:45Z`
+- Physical topology, VLAN mapping, and bridge membership remain unknown unless explicitly documented elsewhere.
+
+## Observed scrape endpoints
+
+| job | instance | scrape URL | network label | exposure label |
+| --- | --- | --- | --- | --- |
+| container-updates | docker-update-exporter:9105 | http://docker-update-exporter:9105/metrics | unknown | unknown |
+| container-updates | raspberrypi.tail13f623.ts.net:9105 | http://raspberrypi.tail13f623.ts.net:9105/metrics | unknown | unknown |
+| kuma | kuma.lan.ddnsgeek.com | http://kuma.lan.ddnsgeek.com/metrics | unknown | unknown |
+| kuma | monitor-kuma:3001 | http://monitor-kuma:3001/metrics | unknown | unknown |
+| node | nix-cache:9100 | http://nix-cache:9100/metrics | unknown | unknown |
+| node | node-exporter:9100 | http://node-exporter:9100/metrics | unknown | unknown |
+| node | pbs.sweet.home:9100 | http://pbs.sweet.home:9100/metrics | unknown | unknown |
+| node | pihole:9100 | http://pihole:9100/metrics | unknown | unknown |
+| node | pve.sweet.home:9100 | http://pve.sweet.home:9100/metrics | unknown | unknown |
+| node | raspberrypi.tail13f623.ts.net:9100 | http://raspberrypi.tail13f623.ts.net:9100/metrics | unknown | unknown |
+| node | server:9100 | http://server:9100/metrics | unknown | unknown |
+| pihole | pihole-exporter:9617 | http://pihole-exporter:9617/metrics | unknown | unknown |
+| prometheus | prometheus:9090 | http://prometheus:9090/metrics | unknown | unknown |
+| proxmox-storage | pbs.sweet.home:9102 | http://pbs.sweet.home:9102/metrics | unknown | unknown |
+| proxmox-storage | pve.sweet.home:9101 | http://pve.sweet.home:9101/metrics | unknown | unknown |
+| telegraf | raspberrypi.tail13f623.ts.net:9273 | http://raspberrypi.tail13f623.ts.net:9273/metrics | unknown | unknown |
+| telegraf | telegraf:9273 | http://telegraf:9273/metrics | unknown | unknown |
+| traefik | raspberrypi.tail13f623.ts.net:8080 | http://raspberrypi.tail13f623.ts.net:8080/metrics | unknown | unknown |
+| traefik | traefik.lan.ddnsgeek.com:8080 | http://traefik.lan.ddnsgeek.com:8080/metrics | unknown | unknown |
+
+## Internal vs public indicators
+
+| exposure label | targets |
+| --- | --- |
+| unknown | 19 |
+
+All indicators above are label-derived. Missing labels are rendered as `unknown`.
+
+## Monitoring paths
+
+| metrics path | observed targets |
+| --- | --- |
+| /metrics | 19 |
+
+## Unknowns and limits
+
+- Prometheus can confirm scrape reachability but not ownership or placement boundaries.
+- No VLAN, switch, or hypervisor placement is inferred unless present in inventory labels.
+- Treat this as runtime evidence to pair with declared architecture docs.