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/Caddyfile

@@ -56,6 +56,21 @@
 	}
 }
 
+# ═══════════════════════════════════════════════════════════════
+# Named snippet: the pre-auth guard chain. Anubis (:8923) challenges,
+# the embedded Authentik outpost authenticates, and authenticated
+# traffic returns to the http://:8017 listener's post-auth handlers.
+# Every guarded vhost is `import guarded` — the chain is EDITED HERE,
+# never inlined per site (rank 6: it used to be nine verbatim copies).
+# Exemptions live in their own vhosts (auth. is the IdP itself; git
+# smart-HTTP and self-authenticating services document their reason).
+# ═══════════════════════════════════════════════════════════════
+(guarded) {
+	reverse_proxy anubis:8923 {
+		header_up X-Real-Ip {remote_host}
+	}
+}
+
 # --- Bare-IP access (health checks, convenience) ---
 :80 {
 	redir https://www.franksdank.cloud/ 308
@@ -72,9 +87,7 @@ franksdank.cloud {
 }
 
 www.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Legacy name: the old homepage name redirects straight onto www ---
@@ -100,9 +113,7 @@ auth.franksdank.cloud {
 
 # --- SearXNG (quadlet; behind the Gluetun tunnel, published 8081) ---
 search.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- OpenWebUI (quadlet on slirp4netns; published 3005) ---
@@ -126,30 +137,22 @@ gitea.franksdank.cloud {
 # never reach Grafana — RP mode needs none and works regardless of topology.
 # The basicauth edge this replaces (CADDY_BASICAUTH_HASH) is retired.
 grafana.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Prometheus ---
 prometheus.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Loki (guarded: Anubis → Authentik; loki-proxy provider, internal_host caddy:8017) ---
 loki.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Seerr (guarded: Anubis → Authentik; seerr provider, internal_host caddy:8017) ---
 seerr.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Marreta (guarded: Anubis → Authentik; marreta provider, internal_host caddy:8017) ---
@@ -157,9 +160,7 @@ seerr.franksdank.cloud {
 # group gate). Egress rides the searxng gluetun tunnel; reached via the
 # host-published port 8082 (gluetun netns), not by container name.
 marreta.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Pi-hole (quadlet on slirp4netns; published 8083) ---
@@ -233,16 +234,12 @@ books.franksdank.cloud {
 
 # --- RomM ---
 romm.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Copyparty ---
 files.franksdank.cloud {
-	reverse_proxy anubis:8923 {
-		header_up X-Real-Ip {remote_host}
-	}
+	import guarded
 }
 
 # --- Jellyfin ---

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)