frank-small: revert vLLM cutover — back to llama.cpp Gemma4-12B Q4_K_M

The vLLM detour (a2b39b1, same day) is retired: the Q4_K_M llama.cpp setup
is the requested shape and the vLLM KV-quant options on sm_86 all measured
dead (fp8 hardware-impossible, int8 page-size unification, turboquant
mm-prefix). Root unit restored, vLLM quadlet/Dockerfile/fetch script moved
to .AGENTTRASH, runbook listed as same-day-reverted. Rollback target:
frank-small-vllm-gemma4.

scripts/frank-small.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=llama.cpp Qwen3.8-27B GSQ-RCO IQ3_S MTP+vision (dankclaw, frank-small)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=dank
+Group=dank
+# CUDA pins its staging buffers, so the process needs the memlock budget even
+# though the weights themselves are copied into VRAM. Parity with the halogen
+# quadlet's Ulimit=memlock=-1:-1 and the retired ik unit.
+LimitMEMLOCK=infinity
+Environment="FRANK_SMALL_ENV_FILE=/home/dank/serverAppConfigs/scripts/frank-small.env"
+ExecStart=/home/dank/serverAppConfigs/scripts/serve-frank-small.sh
+Restart=on-failure
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target