feat(rank6): node-exporter renders from a template; guard chain is one snippet

- service-map render node-exporter-unit --host H: the MIRROR pair comment
  ('keep this file in step') becomes a template. Per-host title, LAN
  address from the hosts map, port from the node-<host> scrape job. Both
  tracked quadlets are now rendered artifacts; check_drift gates them.
- dankclaw/Caddyfile: the nine verbatim Anubis pre-auth chains
  (reverse_proxy anubis:8923 + X-Real-Ip) collapse into the (guarded)
  named snippet; guarded vhosts are 'import guarded'. Validated with real
  caddy 2.11.7 (import resolution clean; the stock image stops at the
  porkbun module and the git basicauth placeholder, as designed).
- vhost-scoped guard greps (authentik, homepage_caddy, marreta_quadlet)
  now pin 'import guarded' in the vhost block.
- Service Inventory + Authentik docs carry the new laws.

dankclaw/observability/quadlet/node-exporter.container

@@ -1,30 +1,32 @@
-# Quadlet unit: node-exporter (rootless, boot-persistent).
+# Quadlet unit: node-exporter (rootless, boot-persistent) — RENDERED ARTIFACT.
+# Regenerate: python3 scripts/service-map.py render node-exporter-unit --host dankclaw
+# Source: shared/services.yml (entry node-exporter) + this template.
 #
 # Install path on dankclaw: ~/.config/containers/systemd/node-exporter.container
 # Unit name: node-exporter.service (container name: node-exporter)
 #
-# Host metrics source for Prometheus. This replaces the compose service of the
-# same name in dankclaw/compose.yaml ("Observability" block).
+# Host metrics source for Prometheus. Replaces the compose service of the same
+# name (the "Observability" block): Dankclaw moved to this quadlet on
+# 2026-09-11, Dankserver on 2026-09-16 — its compose-only copy died at a reboot
+# and stayed dead (rootless Podman does not restart bare containers after the
+# explicit stop shutdown performs), dead for a day and a half before anyone
+# noticed. One owner per container name; no compose file remains anywhere.
 #
 # HOST NAMESPACE. It must run in the host network namespace to report the
 # host's own interfaces/connections, and --pid=host for the processes and
 # cgroups collectors. "localhost" inside the container is therefore the host's
 # loopback, which is what the homepage status timer probes.
 #
-# LISTEN ADDRESSES. Until 2026-09-11 this bound :9100 on every interface. It
-# now binds exactly two: loopback for the homepage status probe, and the LAN
-# address because Prometheus — which runs in a container on dankclaw_default —
-# scrapes http://192.168.0.143:9100 (shared/prometheus/prometheus.yml,
-# job "node-dankclaw"). node_exporter itself has no authentication, so keeping
-# the wildcard bind off the table matters: this is the second half of the
-# pairing that removes the unauthenticated observability surface, and both
-# consumers are accounted for. Dankserver runs its own copy of this container
-# (scraped by the "node-dankserver" job) — since 2026-09-16 as a Quadlet unit in
-# the same shape (dankserver/observability/quadlet/), because the compose-only
-# version it replaced had been dead for a day and a half before anyone noticed.
+# LISTEN ADDRESSES. Exactly two: loopback for the homepage status probe, and
+# the LAN address, because Prometheus — which runs in a container on
+# dankclaw_default — scrapes http://192.168.0.143:9100/metrics
+# (shared/prometheus/prometheus.yml, job "node-dankclaw"). node_exporter has no
+# authentication, so the wildcard bind stays off the table; this is the
+# pairing that removes the unauthenticated observability surface on every
+# host, and both consumers are accounted for.
 #
-# MOUNTS. The container reads the host's /proc, /sys and / as /host/* read-only
-# and is pointed at them with --path.*; it writes nothing anywhere.
+# MOUNTS. The container reads the host's /proc, /sys and / as /host/*
+# read-only and is pointed at them with --path.*; it writes nothing anywhere.
 
 [Unit]
 Description=Prometheus node exporter (Dankclaw host metrics)