PP kit + Strix research: Qwen3.8-27B RPC split (Dankclaw head / Dankserver worker)

- scripts: serve-pp-head/worker, envs, systemd units, pp-test.sh orchestrator, pp-bench.py
- head design verified in b10433 source + live 4B smoke test:
  * no --device with --rpc (RPC device silently dropped otherwise)
  * default device selection = [RPC0, ROCm0] (HIP registers before Vulkan)
  * default split proportional to reported free mem = ~20/80 here, pin 1,1
  * -dio required for large model over RPC
- docs: qwen3.8-strix-optimizations (ranked no-quant-downgrade levers,
  quant landscape, 2026-08-16 test matrix), PP deployment runbook,
  index updates, Dankclaw Improvements corrections (Vulkan0, no power_profile sysfs)
- worker built at 9b05354ec in /home/dank/llama-cpp-rpc worktree (CUDA+RPC)
- second head build build-vulkan-rpc (HIP off) for backend A/B

scripts/serve-pp-worker.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Serve the Qwen3.8-27B pipeline-parallel RPC worker on Dankserver.
+#
+# Runs ggml-rpc-server from the b10433 CUDA+RPC build and exposes the RTX
+# 3090 as a remote device for the head on Dankclaw.
+#
+# Tunables come from frank-pp-worker.env in this directory unless the
+# FRANK_PP_WORKER_ENV_FILE environment variable overrides that path.
+#
+# Security note (upstream): the RPC server is "fragile and insecure". No
+# authentication, no encryption. Keep it on the trusted LAN only.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ENV_FILE="${FRANK_PP_WORKER_ENV_FILE:-$SCRIPT_DIR/frank-pp-worker.env}"
+if [[ -f "$ENV_FILE" ]]; then
+    set -a
+    # shellcheck disable=SC1090
+    source "$ENV_FILE"
+    set +a
+fi
+
+# --- defaults (used when the env file does not set them) -------------------
+: "${RPC_BIND:=192.168.0.235}"
+: "${RPC_PORT:=50052}"
+: "${DEVICE:=CUDA0}"
+: "${THREADS:=7}"
+: "${CACHE:=1}"
+: "${WORKER_BIN:=/home/dank/llama-cpp-rpc/build/bin/ggml-rpc-server}"
+
+if [[ ! -x "$WORKER_BIN" ]]; then
+    echo "missing worker binary: $WORKER_BIN" >&2
+    echo "Build it: cd /home/dank/llama-cpp-rpc && cmake -B build -DBUILD_SHARED_LIBS=OFF -DGGML_CUDA=ON -DGGML_CUDA_FA_ALL_QUANTS=ON -DGGML_RPC=ON -DCMAKE_BUILD_TYPE=Release && cmake --build build --config Release -- -j 8" >&2
+    exit 1
+fi
+
+ARGS=()
+if [[ "${CACHE}" == "1" ]]; then
+    ARGS+=(--cache)
+fi
+
+exec "$WORKER_BIN" \
+    --host "$RPC_BIND" \
+    --port "$RPC_PORT" \
+    --device "$DEVICE" \
+    --threads "$THREADS" \
+    "${ARGS[@]}"