swift15: gate shape MNBT 16384 (w4 arena at 32768 costs 33 GiB), kv 2048, headroom 512

scripts/kld-gate-swift15.sh

@@ -32,14 +32,14 @@ podman run --rm --name "$C" \
     -v "$KLD_REF_DIR:/data/kld-ref:ro" \
     "stilldeadcode/radiance@$PIN" \
     --model /models/rad/qwen4exp-swift15-w4dn8-i8-hc8m.rad \
-    --host-pool-mib 40960 --deterministic --gpu-headroom-mib 768 \
+    --host-pool-mib 40960 --deterministic --gpu-headroom-mib 512 \
     --num-speculative-tokens 0 \
     --kv-cache-dtype fp8 --max-model-len 16384 \
     --ngram-placement ram \
     --override-chat-template /models/tpl.jinja \
     --kld-ref /data/kld-ref --kld-out /data/kld-gate.json \
-    --vram-kv-mib 3072 \
-    --max-num-seqs 4 --max-num-batched-tokens 32768 \
+    --vram-kv-mib 2048 \
+    --max-num-seqs 4 --max-num-batched-tokens 16384 \
     2>&1 | tee "$LOG"
 rc=${PIPESTATUS[0]}
 [ "$rc" -eq 0 ] || { echo "KLD GATE BOOT FAILED rc=$rc; log: $LOG"; exit "$rc"; }