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/frank-pp-worker.env

@@ -0,0 +1,30 @@
+# Worker tunables — Qwen3.8-27B pipeline-parallel RPC worker (Dankserver).
+#
+# The worker is the REMOTE side of the split. It exposes the RTX 3090 to the
+# head on Dankclaw as an RPC device. It runs from the b10433 CUDA+RPC build
+# in /home/dank/llama-cpp-rpc (worktree of /home/dank/llama.cpp).
+#
+# WARNING: do not name any variable here TEMP, HOST, or GPU_MAX_HEAP_SIZE.
+# The ROCm HIP runtime reads those bare env vars (see the 2026-08-13 TEMP
+# incident in docs/deployment.md).
+
+# Bind address and port for ggml-rpc-server. Must be the LAN address the head
+# can reach; the default bind (127.0.0.1) refuses remote clients.
+RPC_BIND=192.168.0.235
+RPC_PORT=50052
+
+# Device to expose. CUDA0 = the RTX 3090.
+DEVICE=CUDA0
+
+# Threads for the worker's CPU device (server has 8 cores; leave 1 for the OS
+# and the running frank-default-small service).
+THREADS=7
+
+# 1: enable the local tensor file cache (~/.cache/llama.cpp/rpc/). The head
+# streams the 31.5 GB model to the worker on first load; with the cache, later
+# loads skip the transfer.
+CACHE=1
+
+# Worker binary. Must be the SAME llama.cpp build as the head (b10433 /
+# 9b05354ec). Version skew hangs the RPC handshake.
+WORKER_BIN=/home/dank/llama-cpp-rpc/build/bin/ggml-rpc-server