frank-large: Q4_K_XL payload + 4 x 163840 sessions (f16 KV)

Frank's call. Payload: ajgazin's abliterated Swift-1.5 UD-Q8_K_XL (29.3 GiB,
SWIFT OPEN LICENSE) -> unsloth/Qwen3.8-27B-GGUF UD-Q4_K_XL (16.35 GiB,
sha256 3f227079...b01e, vanilla/Apache-2.0). NOTE: the endpoint is no longer
uncensored — that was one of the reasons for the Swift payload on 2026-09-28.

New fetcher scripts/download-frank-large-q4.sh (no auth header: repo is public
and ungated; size + sha256 verified after transfer). The speculative drafter
and its fetcher are unchanged.

Shape: --sessions 4 --context 163840 with unquantized KV. gufo exposes no KV
quantization lever (execution_policy.hpp pins kv_cache_storage to kFp16), so
f16 is inherent.

KV arithmetic: f16 KV = 64 KiB/token (16 full-attention layers x 4 KV heads x
256 head_dim x 2 x 2B; the other 48 layers are linear-attention with a
per-sequence fp32 state). 4 x 163840 = 655,360 tokens = 40.0 GiB KV, each
session exactly 10 GiB. Budget ~62 GiB of the 114 GiB GTT.

Seam retargeted (FETCH -> the q4 script, TARGET_STUB, context/sessions pins).

scripts/serve-frank-large.sh

@@ -18,7 +18,7 @@
 # is not an OSI licence.
 #
 # Shape: one session, full 262144 context (the model's native window). The
-# 27B dense weights (29.3 GiB) + the DFlash2 drafter (1.07 GiB) + KV +
+# 27B dense weights (16.35 GiB at UD-Q4_K_XL) + the DFlash2 drafter (1.07) + KV +
 # compute buffers fit the iGPU's GTT aperture (~114 GiB); a load at this
 # context measured 66.5 GiB of the 116.7 GiB device.
 #
@@ -78,7 +78,7 @@ GUFO_BIN="$RUNTIME_DIR/bin/gufo"
 # and keeps its own long filename, while the DFlash2 drafter is unchanged and
 # still lives beside the previous target. MODEL_FILE/DRAFTER_FILE default to
 # the deployed payload, so the env file only has to state them when it moves.
-: "${MODEL_FILE:=$MODEL_DIR/Swift-1.5-Qwen3.8-27B-Uncensored-Dynamic-MTP-UD-Q8_K_XL.gguf}"
+: "${MODEL_FILE:=$MODEL_DIR/Qwen3.8-27B-UD-Q4_K_XL.gguf}"
 : "${DRAFTER_DIR:=/home/dank/models/Qwen3.8-27B-UD-Q8_K_XL}"
 : "${DRAFTER_FILE:=$DRAFTER_DIR/Qwen3.8-27B-DFlash2-Q4_K_M.gguf}"