quadlet: UsernsMode= is compose syntax — use the v1 key UserNS=host

podman 5.7 podman-user-generator on dankserver hard-fails the whole unit on
the unknown key ('unsupported key UsernsMode in group Container'), so the
first cutover attempt masked the native unit and then found no plex.service
at all. Swap both units to UserNS=host (same --userns=host flag), update the
ownership-contract seam test to pin the exact key, and correct both docs.
Pin the seam: the v1 generator rejects unknown Container keys silently at
deploy distance — the test now pins UserNS=, not the misspelled alias.

dankserver/plex/quadlet/plex.container

@@ -6,8 +6,7 @@ Wants=network-online.target
 [Container]
 Image=lscr.io/linuxserver/plex:1.43.3.10896-cb3ebc72d-ls322
 ContainerName=plex
-Network=dankserver_appnet:alias=plex
+UserNS=host
-UsernsMode=host
 Environment=PUID=997
 Environment=PGID=984
 Environment=TZ=America/Los_Angeles

dankserver/tautulli/quadlet/tautulli.container

@@ -5,9 +5,8 @@ Wants=network-online.target
 
 [Container]
 Image=lscr.io/linuxserver/tautulli:v2.18.1-ls242
-ContainerName=tautulli
+UserNS=host
 Network=dankserver_appnet:alias=tautulli
-UsernsMode=host
 Environment=PUID=1000
 Environment=PGID=1000
 Environment=TZ=America/Los_Angeles

serverAppConfigs-docs/Dankserver/Plex.md

@@ -18,7 +18,7 @@ public traffic can be fronted by Caddy like every other vhost.
 | Image | `lscr.io/linuxserver/plex:1.43.3.10896-cb3ebc72d-ls322` (pinned; verified == the ghcr `latest` manifest digest at pin time) |
 | Data root | `/var/lib/plexmediaserver` bind-mounted **in place** as `/config` (RW) — the migration moved zero bytes |
 | Media | `/mnt/entropy` mounted at the same absolute path **read-only** — every library path in the PMS database stayed valid, zero re-scan |
-| Identity | `UsernsMode=host` + `PUID=997 PGID=984` — container writes land owned 997:984, byte-compatible with the former native unit |
+| Identity | `UserNS=host` (quadlet key for `--userns=host`) + `PUID=997 PGID=984` — container writes land owned 997:984, byte-compatible with the former native unit |
 | Port | `32400/tcp` published on `0.0.0.0` — zero client reconfiguration |
 | Network | `dankserver_appnet`, alias `plex`; Tautulli reaches it at `http://plex:32400` |
 | GPU | none by decision — CPU decode only; the RTX 3090 stays dedicated to `frank-default-small` |

serverAppConfigs-docs/Dankserver/Tautulli.md

@@ -16,7 +16,7 @@ it; it talks to PMS over the appnet at `http://plex:32400`).
 | Runtime | podman quadlet, `tautulli.service` (user manager) — migrated from snap `snap.tautulli.tautulli.service` |
 | Image | `lscr.io/linuxserver/tautulli:v2.18.1-ls242` (pinned; verified == the ghcr `latest` manifest digest at pin time) |
 | Data root | `/home/dank/Containers/tautulli` bind-mounted as `/config` (fresh at cutover — the snap's `/var/snap/tautulli/common` was empty) |
-| Identity | `UsernsMode=host` + `PUID=1000 PGID=1000` |
+| Identity | `UserNS=host` (quadlet key for `--userns=host`) + `PUID=1000 PGID=1000` |
 | Port | `8181/tcp` published on `0.0.0.0` |
 | Network | `dankserver_appnet`, alias `tautulli` |
 | PMS URL | `http://plex:32400` — seeded into `config.ini` by the deployer on first start |

tests/dankserver_quadlet.bats

@@ -67,14 +67,14 @@ load helpers
     grep -q '^PublishPort=8181:8181$' "$REPO_ROOT/dankserver/tautulli/quadlet/tautulli.container" || return 1
 }
 
-@test "plex keeps the native unit's identity (userns=host, PUID=997, PGID=984)" {
+@test "plex keeps the native unit's identity (UserNS=host, PUID=997, PGID=984)" {
     # Zero-chown ownership contract: /var/lib/plexmediaserver is bind-mounted
     # in place, so every file the container writes must land owned 997:984 —
-    # byte-identical to the former plexmediaserver.service identity. If the
+    # byte-identical to the former plexmediaserver.service identity. UserNS=
-    # v1 generator ever drops UsernsMode=, files appear as the rootless
+    # is the quadlet v1 key (UsernsMode= is compose syntax and the generator
-    # subuid and the migration invariant is broken; pin both keys.
+    # hard-fails the whole unit on it); pin the exact keys.
     unit="$REPO_ROOT/dankserver/plex/quadlet/plex.container"
-    grep -q '^UsernsMode=host$' "$unit" || return 1
+    grep -q '^UserNS=host$' "$unit" || return 1
     grep -q '^Environment=PUID=997$' "$unit" || return 1
     grep -q '^Environment=PGID=984$' "$unit" || return 1
 }