fix(intern-decision): roll the decision seat back to Intern-Decision-4B; h2o staged with inline-images-only

albok-dev withdrew the judge sign-off on fleet-scale evidence and brokkr
concurred: over 10,841 texts judged by both models, h2o flagged 242 adult at
0.5 against INC's 88, and no threshold reproduces INC's set. rollback-to-inc.sh
ran 14:03:28, INC healthy 14:03:56, /decide/shared smoke 200 x3.

compose.yaml is INC again; the h2o compose is kept as compose.h2o.yaml with
switch-to-h2o.sh (GPU 1 free-memory gate, falls back to INC). It now carries
Prime's inline-images-only setting: LIGHTNING_IMAGE_URLS=off on the front
(verified live: an https image URL is refused before any fetch, inline images
still answer) and vLLM --allowed-media-domains media.invalid as a backstop.
rollback-to-inc.sh no longer leaves timestamped compose copies behind.

stacks/intern-decision/switch-to-h2o.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# Switch the decision seat to h2o-lightning-4b (the staged compose.h2o.yaml), run ON fv-ml1:
+#   sudo bash /opt/docker/compose/intern-decision/switch-to-h2o.sh
+# Only once albok-dev has re-fitted Nemi's judge for h2o (2026-10-12 rollback; see the stack README).
+# It stops INC, checks GPU 1 has room for h2o's measured peak, and either starts h2o or puts INC back.
+# h2o takes ~3 min to healthy (graph capture). Undo with rollback-to-inc.sh.
+set -euo pipefail
+cd /opt/docker/compose/intern-decision
+NEED_MIB=16900   # h2o seat budget 16,847 MiB (peak 16,164 under 4 x 16q x 32k on 2026-10-12)
+docker compose down
+FREE=$(nvidia-smi -i 1 --query-gpu=memory.free --format=csv,noheader,nounits | tr -d ' ')
+if [ "$FREE" -lt "$NEED_MIB" ]; then
+  echo "GPU 1 free ${FREE} MiB < ${NEED_MIB}: not starting h2o; restarting INC"; docker compose up -d; exit 2
+fi
+cp compose.h2o.yaml compose.yaml
+docker compose up -d
+for i in $(seq 1 100); do curl -sf http://127.0.0.1:8033/health >/dev/null && { echo "h2o healthy"; exit 0; }; sleep 3; done
+echo "h2o not healthy after 300 s: run rollback-to-inc.sh"; exit 1