infra(argo): plumb --batch-size + --auto-horizon-weights through template

Adds two new workflow parameters with backward-compatible defaults
(batch-size=1, auto-horizon-weights=false) so existing submissions
behave identically. Both flags are forwarded to alpha_train CLI.

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

scripts/argo-alpha-perception.sh

@@ -27,6 +27,8 @@ LR_MAMBA2=1e-3
 N_TRAIN_SEQS=8000
 N_VAL_SEQS=1000
 SEED=16962
+BATCH_SIZE=1
+AUTO_HORIZON_WEIGHTS=false
 WATCH=false
 
 usage() {
@@ -60,6 +62,8 @@ while [[ $# -gt 0 ]]; do
     --n-train-seqs)      N_TRAIN_SEQS="$2"; shift 2 ;;
     --n-val-seqs)        N_VAL_SEQS="$2"; shift 2 ;;
     --seed)              SEED="$2"; shift 2 ;;
+    --batch-size)        BATCH_SIZE="$2"; shift 2 ;;
+    --auto-horizon-weights) AUTO_HORIZON_WEIGHTS=true; shift ;;
     --watch)             WATCH=true; shift ;;
     -h|--help)           usage; exit 0 ;;
     *) echo "Unknown option: $1"; usage; exit 1 ;;
@@ -123,4 +127,6 @@ argo submit -n foxhunt --from=wftmpl/alpha-perception \
   -p n-train-seqs="$N_TRAIN_SEQS" \
   -p n-val-seqs="$N_VAL_SEQS" \
   -p seed="$SEED" \
+  -p batch-size="$BATCH_SIZE" \
+  -p auto-horizon-weights="$AUTO_HORIZON_WEIGHTS" \
   $WATCH_FLAG