perf: frank-default-small ctx 200000/stream, --no-mmap, batch 3072/1536

Lower each stream to 200000 ctx (pool 600000) to free KV VRAM for the larger
batch. Add --no-mmap so the CPU-resident MoE experts load eagerly into RAM
(avoids decode page faults). Keep KV on GPU. Experts already fully on CPU.

scripts/frank-default-small.env

@@ -4,8 +4,9 @@ MODEL_DIR=/home/dank/models
 ALIAS=frank-default-small
 HOST=0.0.0.0
 PORT=7770
-# 3 parallel slots x 262144 ctx each = 786432 total context pool.
-CTX_SIZE=786432
+# 3 parallel slots x 200000 ctx each = 600000 total context pool.
+# (Reduced from 262144/stream per operator: allows the larger batch to fit VRAM.)
+CTX_SIZE=600000
 PARALLEL=3
 SPEC_TYPE=draft-dflash
 SPEC_N_MAX=7
@@ -21,5 +22,8 @@ N_GPU_LAYERS=all
 BATCH_SIZE=3072
 UBATCH_SIZE=1536
 CTX_CHECKPOINTS=4
+# Load the model into RAM rather than lazy-mapping it. The MoE experts live on
+# CPU, so eager RAM load avoids page faults during decode (uses ~31GB RAM).
+NO_MMAP=1
 THREADS=8
 THREADS_HTTP=8