Swap frank-default-large to DFlash2 on Vulkan (PR #27342)

Replace the retired CIRU ROCmFPX runtime with upstream llama.cpp PR #27342
DFlash2 on the Vulkan backend:

- Target: unsloth Qwen3.8-27B-UD-Q8_K_XL.gguf (31.4 GB, already on disk)
- Drafter: z-lab Qwen3.8-27B-DFlash2-Q4_K_M.gguf (block size 8, top-k 16)
- Runtime: /home/dank/llama.cpp-dflash2/build-dflash2/bin/llama-server
  (GGML_VULKAN=ON; HIP lacks TOP_K so the stack runs on Vulkan0/RADV)
- spec: --spec-type draft-dflash --spec-draft-n-max 8 (clamps to 7)

Validated 2026-08-21 on scratch port 52626: mean acceptance 5.27,
health + reasoning completion OK.

Archive the retired CIRU .env/.serve script in .AGENTTRASH.
Update deployment.md, index.md, AGENTS.md; add docs/dflash2-large-vulkan.md.

docs/index.md

@@ -1,8 +1,8 @@
 # vLLM Scripts — Knowledge Base
 
 Documentation for the LLM inference fleet on two local machines
-(2026-08-18): upstream llama.cpp on Dankserver (frank-default-small) and
-CIRU ROCmFPX llama.cpp on Dankclaw (frank-default-large).
+(2026-08-21): upstream llama.cpp on Dankserver (frank-default-small) and
+upstream llama.cpp PR #27342 DFlash2 on Dankclaw (frank-default-large).
 
 ## Deployment Topology
 
@@ -19,10 +19,11 @@ ngram-mod, 36 MoE experts on CPU, 700K ctx]
 
     subgraph Dankclaw[AMD Strix Halo - Ubuntu 26.04]
         D[gfx1151 iGPU 64 GiB unified memory]
-        E[CIRU ROCmFPX llama.cpp
+        E[upstream llama.cpp PR #27342 DFlash2, Vulkan
 frank-default-large, port 52625]
-        F[jcbtc Qwen3.8-27B-CIRU-ActiveFPX-PromptForge
-262K ctx / 1 slot, native MTP, PromptForge DualView]
+        F[unsloth Qwen3.8-27B-UD-Q8_K_XL +
+z-lab Qwen3.8-27B-DFlash2-Q4_K_M drafter
+262K ctx / 1 slot, DFlash2 spec]
         D --> E --> F
     end
 
@@ -41,16 +42,21 @@ frank-default-large, port 52625]
 
 - [[deployment]] — deploy and update process for both servers
 - [[frank-redo-2026-08-17]] — the 2026-08-17 topology change
-- [[ciru-activefpx-promptforge]] — the CIRU runtime on Dankclaw
-  (frank-default-large)
+- [[dflash2-large-vulkan]] — the DFlash2 runtime on Dankclaw
+  (frank-default-large, Vulkan)
 - [[Dankserver]] — the upstream llama.cpp box (frank-default-small)
-- [[Dankclaw]] — the CIRU ROCmFPX box (frank-default-large)
+- [[Dankclaw]] — the DFlash2 Vulkan box (frank-default-large)
 
-## CIRU Reference (Dankclaw)
+## DFlash2 Reference (Dankclaw)
 
-- [[ciru-activefpx-promptforge]] — model, ROCm 7.15 toolchain, build,
+- [[dflash2-large-vulkan]] — DFlash2 model, Vulkan build, build runbook,
   and the frank-default-large service
 
+## CIRU Reference (retired)
+
+- [[ciru-activefpx-promptforge]] — the retired CIRU ROCmFPX runtime
+  (archived in .AGENTTRASH, 2026-08-21)
+
 ## vLLM Reference (historical)
 
 - [[VLLM Overview]] — installation, CLI, API, architecture, quantization, parallelism