Reduce frank-default-large context for KV headroom

docs/LLM/deployment.md

@@ -145,8 +145,9 @@ The active service on Dankclaw is the charlie12345/ROCmFPX llama.cpp runtime
 against system ROCm 7.2.4 / amdclang 22) with a **strict Qwen MTP** draft
 (`--spec-type draft-mtp --spec-mtp-strict-qwen`) running on ROCm0 with all
 layers (`--spec-draft-ngl all`) — no separate draft file, because the MTP head
-is embedded in the main GGUF. K/V are f16, full 262144 context (1 slot,
-concurrent requests queue, the server never preempts a running generation),
+is embedded in the main GGUF. K/V are f16, 196608 context (64K below the
+native 262144 maximum; 1 slot, concurrent requests queue, the server never
+preempts a running generation),
 `-t 16 -tb 32`, batch 512 / ubatch 256 (ubatch is swappable; sweep it on 8k
 context with `scripts/bench-ubatch-rocmi4.sh`), 16 context checkpoints, 8 GiB
 prompt cache, and reasoning in deepseek format. The unit file is