fix(run-swift15-bf16): kv pool 3072 both offline arms

The weights slab derives as card - headroom - kv, and the disk tier
refuses under 9.57 GiB (4.21 layer buffers + 5.36 fixed). 4608 starved
it (8.68 budget, DID NOT FIT). 3072 leaves 10.2 for weights; 4x16k fp8
slots fit the pool, recording is prefill-bound so slot count only
queues pushes.

scripts/run-swift15-bf16.sh

@@ -46,23 +46,29 @@ ARGS=(--model /models/rad/qwen4exp-swift15-bf16.rad
 case "$MODE" in
   kld)
     # 1.0.13: the engine that will serve the candidate — the reference is
-    # recorded on the same engine that scores it. The ratio-derived KV pool
-    # (1.95 GiB) is SHORT by 217 MiB at 32x16k; the pair is explicit: 16 slots
-    # need 2.17 fixed + 1.87 GiB of fp8 KV, 4608 MiB carries the margin.
+    # recorded on the same engine that scores it. The weights slab DERIVES as
+    # card - headroom - kv, and the disk tier refuses under 9.57 GiB (4.21 of
+    # layer buffers + 5.36 fixed), so kv is explicit SMALL: recording is
+    # prefill-only, self-batched at MNBT 32768 = two 16k prompts at a time;
+    # 4 slots x 16k fp8 (29 KiB/pos, 1.7 GiB) + headroom fits 3072.
     IMAGE="stilldeadcode/radiance@$PIN_1013"
     mkdir -p "$KLD_REF_DIR"
     ARGS+=(--kld-record /data/kld-ref --kld-corpus /data/kld.jsonl
-           --vram-kv-mib 4608
-           --max-num-seqs 16 --max-num-batched-tokens 32768)
+           --vram-kv-mib 3072
+           --max-num-seqs 4 --max-num-batched-tokens 32768)
     ;;
   calib)
     # 1.2.0: the calibration tap (RADIANCE_CALIB_DIR + RADIANCE_CALIB_TOKENS)
     # lives in the 1.2.0 qwen4exp plugin; 1.0.13 has only the DIR half with an
     # unparameterisable threshold. Grams are bf16 activations — engine-invariant.
+    # Same KV ceiling as kld: the disk-tier weights floor (9.57 GiB) plus
+    # ~18 GiB of fixed per-rank claims cap the pool near 3.5 GiB on a 32 GiB
+    # card. 4 slots x 16k fp8 fits; prefill rate is disk-bound, so fewer
+    # resident slots only queues pushes, it does not slow the record.
     IMAGE="stilldeadcode/radiance@$PIN_120"
     mkdir -p "$CALIB_DIR"
-    ARGS+=(--port 7770 --vram-kv-mib 9984
-           --max-num-seqs 64 --max-num-batched-tokens 65536
+    ARGS+=(--port 7770 --vram-kv-mib 3072
+           --max-num-seqs 4 --max-num-batched-tokens 32768
            --prefix-cache-dir /data/calib-kvcache)
     ;;
   probe)