frank-large: ROCmFPX llama.cpp on the Q8_0_ROCMFPX_AGENT file, MTP drafting

The repo's highest-quality rung is ftype 115: 311 tensors of
GGML_TYPE_Q8_0_ROCMFPX, a type only the ROCmFPX fork reads, so the runtime
moves from gufo to scripts/build-rocmfpx.sh's pinned fork build (36e9acd) —
the first build on this host measured to load this file without the
2026-08-25 set_rows segfault. One session at the native 262,144 window, f16
KV (64 KiB/token, 16 GiB), the repo's Q4_0 MTP head drafting 4 tokens, plus
the bundled BF16 projector so the endpoint has vision again.

The serve script now honors caller environment overrides over the env file
(a plain source let the file win, which made single-run overrides no-ops) and
defaults apply only when a value is unset, so an explicit LLAMA_BIN='' is the
error it reads as.

scripts/build-rocmfpx.sh

@@ -0,0 +1,89 @@
+#!/usr/bin/env bash
+# Build the ROCmFPX runtime that serves frank-large on Dankclaw.
+#
+#   bash scripts/build-rocmfpx.sh              # clone/fetch + build the pin
+#   bash scripts/build-rocmfpx.sh --verify     # only check the installed tree
+#
+# Runtime: kingjones30/ROCmFPX — charlie12345/ROCmFPX plus the model-card
+# patches, i.e. the fork that owns the ROCmFPx tensor formats. frank-large's
+# payload is ftype 115 (`Q8_0_ROCMFPX_AGENT`): 311 tensors of
+# GGML_TYPE_Q8_0_ROCMFPX (103), a type that exists ONLY in this fork, so
+# stock llama.cpp, gufo and every other loader on the host reject the file.
+# This is the same tree that served the Qwen3.8-Flash-Next ROCmFP4 STRIX
+# endpoint 2026-08-30 → 09-11 (see the kingjones runbook), rebuilt here so a
+# fresh host can be brought up from the repo alone.
+#
+# Why this commit and not a newer one: 36e9acd (2026-08-28) is what was
+# qualified against this payload on 2026-10-02 — it loads ftype 115, survives
+# warmup, and drafts with the MTP head at acceptance 0.65. The five legacy
+# builds of 2026-08-25 crashed this same file in ggml_compute_forward_set_rows
+# (see kingjones-q8agent-rocmfpx.md), so the pin is load-bearing: do not bump
+# it without re-running that crash test.
+#
+# Host notes:
+#   * -DLLAMA_BUILD_WEBUI=OFF is REQUIRED on this box. The tree provisions its
+#     embedded UI assets via npm or the HF llama-ui bucket; npm is absent here
+#     and the bucket download half-failed, aborting the link at 98%. The API
+#     server is unaffected.
+#   * The build links against the host ROCm (/opt/rocm); no bundled toolchain
+#     like the gfx1201 R9700 build needed.
+set -euo pipefail
+
+ROCMFPX_REPO="${ROCMFPX_REPO:-https://github.com/kingjones30/ROCmFPX.git}"
+# The commit frank-large was qualified with (measured 2026-10-02).
+ROCMFPX_COMMIT="${ROCMFPX_COMMIT:-36e9acd40e10a87cd3c3ef8ec734668757dc8520}"
+SRC_DIR="${ROCMFPX_SRC_DIR:-/home/dank/GitPackages/kingjones-ROCmFPX}"
+BUILD_DIR="${ROCMFPX_BUILD_DIR:-$SRC_DIR/build}"
+GPU_TARGET="${ROCMFPX_GPU_TARGET:-gfx1151}"
+JOBS="${JOBS:-$(nproc)}"
+
+# check_pin — refuse a source tree that is not the qualified commit. A moved
+# fork means different kernels under the same path, and on this model line a
+# wrong build is a segfault at first request, not a clean error.
+check_pin() {
+    local commit
+    commit="$(git -C "$SRC_DIR" rev-parse HEAD 2>/dev/null || true)"
+    if [[ -n "$commit" && "$commit" != "$ROCMFPX_COMMIT" ]]; then
+        echo "ROCMFPX_COMMIT mismatch: $SRC_DIR is at $commit, pinned $ROCMFPX_COMMIT" >&2
+        exit 1
+    fi
+}
+
+if [[ "${1:-}" == "--verify" ]]; then
+    check_pin
+    [[ -x "$BUILD_DIR/bin/llama-server" ]] || {
+        echo "no ROCmFPX llama-server at $BUILD_DIR/bin/llama-server" >&2
+        exit 1
+    }
+    # The format the endpoint exists for: the fork must carry the ROCmFPx
+    # tensor type, or the payload cannot load at all.
+    "$BUILD_DIR/bin/llama-server" --help 2>&1 | grep -q -- '--spec-type' || {
+        echo "$BUILD_DIR/bin/llama-server has no --spec-type: MTP drafting is impossible" >&2
+        exit 1
+    }
+    "$BUILD_DIR/bin/llama-server" --version | head -1
+    exit 0
+fi
+
+echo "== source: $ROCMFPX_REPO @ $ROCMFPX_COMMIT =="
+if [[ ! -d "$SRC_DIR/.git" ]]; then
+    mkdir -p "$(dirname "$SRC_DIR")"
+    git clone "$ROCMFPX_REPO" "$SRC_DIR"
+fi
+git -C "$SRC_DIR" fetch --quiet origin "$ROCMFPX_COMMIT" || true
+git -C "$SRC_DIR" checkout -q --detach "$ROCMFPX_COMMIT"
+check_pin
+echo "   $(git -C "$SRC_DIR" rev-parse HEAD)"
+
+echo "== configure + build (release, HIP $GPU_TARGET) =="
+cmake -S "$SRC_DIR" -B "$BUILD_DIR" \
+    -DGGML_HIP=ON \
+    -DGPU_TARGETS="$GPU_TARGET" \
+    -DGGML_NATIVE=ON \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DLLAMA_BUILD_WEBUI=OFF
+cmake --build "$BUILD_DIR" --target llama-server llama-quantize -j "$JOBS"
+
+echo "== verify =="
+"$BUILD_DIR/bin/llama-server" --version | head -1
+echo "frank-large runtime ready: $BUILD_DIR/bin/llama-server ($ROCMFPX_COMMIT)"