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-head.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=llama.cpp Qwen3.8-27B pipeline-parallel head (Strix + RPC to Dankserver)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=dank
+Group=dank
+Environment="FRANK_PP_HEAD_ENV_FILE=/home/dank/vllmScripts/scripts/frank-pp-head.env"
+ExecStart=/home/dank/vllmScripts/scripts/serve-pp-head.sh
+Restart=on-failure
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target