refactor(playbooks): host-generic GPU host + GPU LXC playbooks for nh3-ml1

- esh-pve-nvidia-host -> pve-nvidia-host: headers/dkms/build-essential step,
  nouveau blacklist + guarded unload (refuses if nouveau bound a device)
- esh-ml1-lxc -> gpu-lxc: host vars have no defaults (elway aborts on undefined),
  rootfs storage/startup order parameterized, CT kept out of all-guests vzdump jobs
- embed-rerank: Homepage labels take HOST_NAME/HOST_IP, defaults = esh-ml1

stacks/embed-rerank/.env.example

@@ -1,4 +1,10 @@
-# embed-rerank tunables (esh-ml1, TEI). Copy to `.env` on the server.
+# embed-rerank tunables (TEI). Copy to `.env` on the server.
+
+# Per-host Homepage labels. Unset = esh-ml1's values. nh3-ml1 sets:
+#   HOST_NAME=nh3-ml1
+#   HOST_IP=10.100.50.80
+#HOST_NAME=esh-ml1
+#HOST_IP=10.0.50.80
 
 # TEI image tag. `89-` = the Ada Lovelace (sm_89) build; a different GPU
 # generation needs a different prefix (see the TEI README's image table).

stacks/embed-rerank/compose.yaml

@@ -1,6 +1,8 @@
 # embed-rerank — THE fleet's embedding + reranking service, on esh-ml1 (CT 110 on
 # esh-pve, RTX 2000E Ada, 16 GB). Served by Hugging Face Text Embeddings
-# Inference (TEI).
+# Inference (TEI). A second instance runs on nh3-ml1 (CT 109 on nh3-pve, the same
+# card) since 2026-09-25; the per-host bits are HOST_NAME / HOST_IP in .env, and
+# their defaults are esh-ml1's, so esh-ml1's live .env needs no change.
 #
 # Prime, 2026-09-25: "TEI is embed/reranker server for esh-ml1 and the FLEET in
 # general, in future." It replaced vLLM here the same day, after a side-by-side
@@ -30,7 +32,7 @@
 # ports, and in practice only the LiteLLM gateway does (verified from the seats'
 # logs 2026-09-25: every request matched a gateway spend-log row).
 #
-# Host setup: playbooks/esh-pve-nvidia-host.yaml, then playbooks/esh-ml1-lxc.yaml.
+# Host setup: playbooks/pve-nvidia-host.yaml, then playbooks/gpu-lxc.yaml.
 # Tunables live in .env.
 
 name: embed-rerank
@@ -76,10 +78,10 @@ services:
       start_period: 60s
     labels:
       - homepage.group=AI - Eval & Retrieval
-      - homepage.name=Embed — Qwen3 0.6B (TEI, esh-ml1)
+      - homepage.name=Embed — Qwen3 0.6B (TEI, ${HOST_NAME:-esh-ml1})
       - homepage.icon=mdi-vector-arrange-below
-      - homepage.description=Fleet embeddings (qwen3-embedding) via TEI on esh-ml1
-      - homepage.href=http://10.0.50.80:${EMBED_PORT}/docs
+      - homepage.description=Fleet embeddings (qwen3-embedding) via TEI on ${HOST_NAME:-esh-ml1}
+      - homepage.href=http://${HOST_IP:-10.0.50.80}:${EMBED_PORT}/docs
 
   tei-rerank:
     image: ghcr.io/huggingface/text-embeddings-inference:${TEI_TAG}
@@ -117,7 +119,7 @@ services:
       start_period: 60s
     labels:
       - homepage.group=AI - Eval & Retrieval
-      - homepage.name=Rerank — bge-v2-m3 (TEI, esh-ml1)
+      - homepage.name=Rerank — bge-v2-m3 (TEI, ${HOST_NAME:-esh-ml1})
       - homepage.icon=mdi-sort-variant
-      - homepage.description=Fleet reranker (reranker) via TEI on esh-ml1
-      - homepage.href=http://10.0.50.80:${RERANK_PORT}/docs
+      - homepage.description=Fleet reranker (reranker) via TEI on ${HOST_NAME:-esh-ml1}
+      - homepage.href=http://${HOST_IP:-10.0.50.80}:${RERANK_PORT}/docs