frank-default-small: lower context by 32k per stream for cache headroom

3 slots x 229376 (262144 - 32768) = 688128 total context. Updates the
.env, models.json (contextWindow/maxTokens 229376 per slot), and the
index/deployment/ornith runbook references.

docs/LLM/dealign-ornith-crack.md

@@ -77,7 +77,7 @@ llama-server \
   --chat-template-file chat-template.jinja \
   --spec-type draft-mtp \
   --override-tensor "\.ffn_(up|down|gate|gate_up)_(ch|)exps=CPU" \
-  -ngl all -c 786432 -np 3 \
+  -ngl all -c 688128 -np 3 \
   --cache-type-k f16 --cache-type-v f16 --no-mmap \
   --temp 1.0 --top-p 0.95 --top-k 20
 ```