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.

serverAppConfigs-docs/index.md

@@ -166,17 +166,15 @@ The LLM inference fleet on the two hosts. Full index:
 - [[ciru-activefpx-promptforge]] — the RETIRED v3 CIRU PromptForge runtime on Dankclaw (superseded 2026-08-24)
 - [[kingjones-strix-mtp]] — the kingjones Qwen3.8-27B ROCmFP4 STRIX MTP model on Dankclaw (active)
 - [[dealign-ornith-crack]] — the retired Ornith-1.5-35B-A3B CRACK model on Dankserver (retired 2026-09-02)
-- [[frank-small-vllm-gemma4]] — the ACTIVE frank-small runbook since
-  2026-09-19: vLLM serving
-  google/gemma-4-12B-it-qat-w4a16-ct (compressed-tensors w4a16, Marlin)
-  with Google's bf16 MTP assistant (bf16 KV, 289,647-token pool, 2
-  full-context sessions, native text+image+audio) on
-  Dankclaw's RTX 3090, port 7771
-- [[frank-small-gemma4-12b]] — RETIRED 2026-09-19 (rollback target):
-  mainline llama.cpp serving
+- [[frank-small-gemma4-12b]] — the ACTIVE frank-small runbook since
+  2026-09-17: mainline llama.cpp serving
   HauhauCS/Gemma4-12B-QAT-Uncensored-HauhauCS-Balanced at Q4_K_M
-  (MTP assistant sidecar + ngram-mod, q8_0 KV, 4 slots of 262k) on
-  Dankclaw's RTX 3090
+  (MTP assistant sidecar + ngram-mod, q8_0 KV, --fit → 262k) on
+  Dankclaw's RTX 3090, port 7771
+- [[frank-small-vllm-gemma4]] — RETIRED 2026-09-19 (same-day revert,
+  rollback target): vLLM serving google/gemma-4-12B-it-qat-w4a16-ct (w4a16
+  Marlin) with the bf16 MTP assistant on the RTX 3090 — bf16 KV, 289,647-
+  token pool, 2 concurrent full-context sessions, native text+image+audio
 - [[frank-small-qwen38-gsq-rco]] — RETIRED 2026-09-17 (rollback target):
   the prior frank-small runbook (2026-09-16 → 09-17), ISTA-DASLab
   Qwen3.8-27B-GSQ-RCO IQ3_S with own in-file MTP head + BF16 projector