feat(infra): plumb FOXHUNT_BAND_ENABLED through alpha-rl template

Mirror of the FOXHUNT_USE_MULTI_HEAD_POLICY pattern (c5036af03).
Adds --band-enabled flag to argo-alpha-rl.sh and band-enabled
workflow parameter wired into the container env block.

Required for Phase 4-C cluster verification of the full Tier 3
no-transaction-band stack (commits e41a73208 → 65c328d3f).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

infra/k8s/argo/alpha-rl-template.yaml

@@ -63,6 +63,8 @@ spec:
         value: "false"
       - name: use-multi-head-policy
         value: "0"
+      - name: band-enabled
+        value: "0"
 
   volumes:
     - name: git-ssh-key
@@ -106,6 +108,8 @@ spec:
             value: "1"
           - name: FOXHUNT_USE_MULTI_HEAD_POLICY
             value: "{{workflow.parameters.use-multi-head-policy}}"
+          - name: FOXHUNT_BAND_ENABLED
+            value: "{{workflow.parameters.band-enabled}}"
         resources:
           requests:
             cpu: "4"

scripts/argo-alpha-rl.sh

@@ -47,6 +47,7 @@ WATCH=false
 SKIP_PUSH_CHECK=false
 SKIP_TEMPLATE_APPLY=false
 USE_MULTI_HEAD_POLICY=0
+BAND_ENABLED=0
 
 usage() {
   cat <<EOF
@@ -111,6 +112,7 @@ while [[ $# -gt 0 ]]; do
     --skip-push-check)     SKIP_PUSH_CHECK=true; shift ;;
     --skip-template-apply) SKIP_TEMPLATE_APPLY=true; shift ;;
     --use-multi-head-policy) USE_MULTI_HEAD_POLICY="$2"; shift 2 ;;
+    --band-enabled)        BAND_ENABLED="$2"; shift 2 ;;
     -h|--help)             usage; exit 0 ;;
     *) echo "Unknown option: $1"; usage; exit 1 ;;
   esac
@@ -224,4 +226,5 @@ argo submit -n foxhunt --from=wftmpl/alpha-rl \
   -p n-folds="$N_FOLDS" \
   -p n-eval-steps="$N_EVAL_STEPS" \
   -p use-multi-head-policy="$USE_MULTI_HEAD_POLICY" \
+  -p band-enabled="$BAND_ENABLED" \
   $WATCH_FLAG