frank-large: document the ik_llama.cpp deployment and the decode performance campaign

- Runbook with the measured envelope (prefill ~192 t/s at the VNNI ceiling;
  decode ~3.8-4.3 t/s gated by 100 backend splits/token, GPU 95% idle), the
  root-cause evidence chain, tuning levers, and co-tenancy traps
- AGENTS.md: fleet topology row + Active Services section for the ik
  deployment; halogen demoted to rollback; bench policy unit type fixed
- LLM + root indexes relinked (frank-large-ik-uncensored ACTIVE,
  halogen-flash-server retired)

serverAppConfigs-docs/index.md

@@ -125,8 +125,12 @@ The LLM inference fleet on the two hosts. Full index:
   agentionai/Qwen3.8-Flash-Next-ROCmFP4-FAST-imatrix (87.06 GiB,
   Q4_0_ROCMFP4_FAST) + own MTP draft, build-qwen38 (retired 2026-08-30;
   rollback record)
-- [[halogen-flash-server]] — the ACTIVE frank-large runbook since
-  2026-09-11: peonist-ai/halogen-flash-server 0.5.8 serving
+- [[frank-large-ik-uncensored]] — the ACTIVE frank-large runbook since
+  2026-09-15: ik_llama.cpp serving mradermacher/Qwen3.8-Flash-Next-
+  Uncensored-i1-Q4_K_M on the RTX 3090 + Strix Halo hybrid (root systemd
+  unit, port 7770) — measured performance envelope and traps
+- [[halogen-flash-server]] — the RETIRED 2026-09-15 halogen runbook and
+  rollback target: peonist-ai/halogen-flash-server 0.5.8 serving
   peonist-ai/halogen-qwen3.8-flash-next (w4b) as a rootless Quadlet
   container on Dankclaw, port 7770 — flags, memory model, client contract
 - [[dankclaw-iommu-translation-off]] — why Dankclaw boots with