frank-default-large: full 262144 context, 1 slot

User request 2026-08-19 (second pass): parallel slots degraded
performance. PARALLEL=1, CTX_SIZE=262144 (native max, -c equals the
per-slot context with one slot). Concurrent requests queue on the
single slot; the server never preempts a running generation.
pi models.json contextWindow/maxTokens back to 262144 (outside repo).
Docs updated to match.

docs/index.md

@@ -22,7 +22,7 @@ ngram-mod, 36 MoE experts on CPU, 700K ctx]
         E[CIRU ROCmFPX llama.cpp
 frank-default-large, port 52625]
         F[jcbtc Qwen3.8-27B-CIRU-ActiveFPX-PromptForge
-200K ctx / 2 slots, native MTP, PromptForge DualView]
+262K ctx / 1 slot, native MTP, PromptForge DualView]
         D --> E --> F
     end