feat(frank-medium): quantization-aware entrypoint + FP8 model swap

The entrypoint now reads the model's weight quantization from config.json
and serves the plain FP8 path (no MXFP4 patches, --quantization=fp8, MTP
self-speculation, ROCM_AITER unified attention with the R4D all-reduce)
or the MXFP4 patch-and-serve path. A model swap is now: change SNAP
(+ SPEC_METHOD/SPEC), restart.

- radiance-entrypoint.sh: quantization detection, gated MXFP4 env vars
  and patch block, --quantization fp8 flag
- quadlet: SNAP -> Qwen3.8-27B-Uncensored-FP8, SPEC_METHOD=mtp, SPEC=8,
  KV_MEM=0 (profile the shape, the documented plain-FP8 default)
- deploy-remote.sh: model-aware gates (read SNAP/SPEC_METHOD from the
  quadlet; drafter gate only for dflash, r4d.so gate only for mxfp4)
- tests: quantization-aware drafter/spec and KV-pool tests
- hf-fetch.sh: generic, resumable, verified, idempotent HF fetch tool
- frank-medium-fp8.manifest: 17 files (10 config + 7 shards) with sizes
  and LFS sha256

scripts/deploy-remote.sh

@@ -1211,6 +1211,19 @@ deploy_llm_medium() {
     # missing never becomes healthy, and a green deploy would leave the endpoint
     # dark with nothing in the deploy log to say why.
     local missing=0
+    # Model-aware gates: read the serving shape from the quadlet (the source
+    # of truth), so a model swap is just "edit the quadlet + deploy". The
+    # container /models mount maps to /home/dank/models on the host. The
+    # drafter gate applies only to the dflash path; the patched libr4d gate
+    # applies only to the mxfp4/quark path (the plain FP8 path uses the
+    # image's built-in r4d.so and skips the MXFP4 patches).
+    local quadlet_file="dankserver/frank-medium/quadlet/frank-medium.container"
+    local snap_c snap spec_method quant
+    snap_c="$(grep -E '^Environment=SNAP=' "$quadlet_file" | head -1 | cut -d= -f2-)"
+    spec_method="$(grep -E '^Environment=SPEC_METHOD=' "$quadlet_file" | head -1 | cut -d= -f2-)"
+    snap="/home/dank/models${snap_c#/models}"
+    quant="$(python3 -c 'import json,sys;print(json.load(open(sys.argv[1])).get("quantization_config",{}).get("quant_method",""))' "$snap/config.json" 2>/dev/null || true)"
+    [[ -n "$snap_c" ]] || { echo "ERROR: cannot read SNAP from $quadlet_file" >&2; return 1; }
     if ! podman image exists "$LLM_MEDIUM_IMAGE_LOCAL"; then
         if podman image exists "$LLM_MEDIUM_IMAGE"; then
             podman tag "$LLM_MEDIUM_IMAGE" "$LLM_MEDIUM_IMAGE_LOCAL"
@@ -1220,27 +1233,33 @@ deploy_llm_medium() {
             missing=1
         fi
     fi
-    if [[ ! -f "$LLM_MEDIUM_SNAP/config.json" ]]; then
-        echo "ERROR: MXFP4 checkpoint absent at $LLM_MEDIUM_SNAP" >&2
+    if [[ ! -f "$snap/config.json" ]]; then
+        echo "ERROR: model checkpoint absent at $snap" >&2
         missing=1
     fi
-    if [[ ! -f "$LLM_MEDIUM_DRAFTER/config.json" ]]; then
+    if [[ "$spec_method" == "dflash" && ! -f "$LLM_MEDIUM_DRAFTER/config.json" ]]; then
         echo "ERROR: DFlash2-FP8 drafter absent at $LLM_MEDIUM_DRAFTER" >&2
         missing=1
     fi
-    # The patches clone is mounted and its scripts run at EVERY container start;
-    # the chat template is the fleet's reasoning-format contract.
+    # The patches clone is mounted and its scripts run at EVERY container start
+    # on the MXFP4 path; the chat template is the fleet's reasoning-format
+    # contract on both paths.
     if [[ ! -f "$LLM_MEDIUM_PATCHES/qwen-fixed-v22.3.jinja" ]]; then
         echo "ERROR: pinned patch clone / chat template absent at $LLM_MEDIUM_PATCHES" >&2
         echo "frank-medium: git clone https://github.com/ggz14/radiance-vllm-mxfp4 $LLM_MEDIUM_PATCHES" >&2
         missing=1
     fi
     # The image's shipped r4d.so predates the gated-delta-net overflow fix and
-    # NaNs this model, so the patched build is not optional.
-    if [[ ! -f "$LLM_MEDIUM_R4D/r4d.so" ]]; then
-        echo "ERROR: patched libr4d absent at $LLM_MEDIUM_R4D" >&2
-        missing=1
-    fi
+    # NaNs the MXFP4 model, so the patched build is not optional there. The
+    # plain FP8 path uses the image's built-in r4d.so (no MXFP4 patches).
+    case "$quant" in
+      mxfp4|quark)
+        if [[ ! -f "$LLM_MEDIUM_R4D/r4d.so" ]]; then
+            echo "ERROR: patched libr4d absent at $LLM_MEDIUM_R4D" >&2
+            missing=1
+        fi
+        ;;
+    esac
     [[ "$missing" -eq 0 ]] || return 1
     mkdir -p "$LLM_MEDIUM_CACHE"