docs: frank-large halogen runbook, AGENTS.md + indices for the swap

New runbook frank-large-halogen27b-dflash2.md; LLM + vault indices
re-pointed, ROCmFPX q6agent runbook marked RETIRED (rollback target);
AGENTS.md topology row, detail section, image-capability paragraph
(two endpoints accept images now), bench-law prose and runbook index
updated.

serverAppConfigs-docs/index.md

@@ -213,8 +213,16 @@ 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)
-- [[frank-large-rocmfpx-q6agent-uncensored-mtp]] — the ACTIVE frank-large
-  runbook since 2026-10-03 (root systemd unit, port 7770): the pinned
+- [[frank-large-halogen27b-dflash2]] — the ACTIVE frank-large runbook since
+  2026-10-05 (root systemd unit + podman, port 7770): the digest-pinned
+  ghcr.io/peonist-ai/halogen image serving peonist-ai/halogen-qwen3.8-27b
+  (qwen3.8-27b-p1w4d-d2.hgn, 33.4 GiB — a .hgn that loads in no other
+  engine) with the DFlash2 drafter on ONE slot of 200,700 ctx (slots>1
+  disables speculation — engine law); TEXT-ONLY and censored base, both
+  accepted tradeoffs; no server-side sampler, so the thinking recipe rides
+  the wire
+- [[frank-large-rocmfpx-q6agent-uncensored-mtp]] — RETIRED 2026-10-03 → 10-05
+  (rollback target; payload, fork build and build script on disk): the pinned
   kingjones30/ROCmFPX fork (scripts/build-rocmfpx.sh) serving kingjones777/
   Qwen3.8-27B-Uncensored-ROCmFP4-STRIX-MTP-GGUF
   **Qwen3.8-27B-Uncensored-Q6_0_ROCMFPX_AGENT** — ftype 114, 339 tensors of