fix(frank-zealot): 2 x 262,144 over unquantized f16 KV

Frank: "shift frank-zealot to 2 parallels of unquantized kv".

Shape: CTX_SIZE 786432 -> 524288, PARALLEL 3 -> 2, CACHE_TYPE_K/V
q8_0 -> f16. The per-slot window is UNCHANGED at 262,144 (the native
trained window, and models.yml contextWindow), so what the exact cache
buys is fidelity and what it pays is one concurrent conversation.

The POOL is the term that had to move: exact KV bills 32,768 B/token at
this geometry (8 full-attention layers x 4 KV heads x 256 dim, 2 B,
K and V), so the old 786,432 pool asks 24,576 MiB against the 24,123 MiB
the driver leaves addressable. 524,288 positions = 16,384 MiB, projected
~21,200 used / ~2,900 free from the 13:19 boot ledger (only the KV pool
and one recurrent-state cell move).

Also corrects a repo-wide arithmetic error: "f16 would bill 26,112 MiB"
doubled the q8_0 ledger figure INCLUDING its 1/32 scale overhead. q8_0 is
1.0625 B/element, f16 exactly 2.0, so the true ratio is 1.882x. The wall
stands; the number was wrong.

And it corrects a false claim about the drafter: this build DOES expose
--spec-draft-type-k / --spec-draft-type-v (verified against
llama-server --help), so the draft cache is quantizable -- the
exact-KV-plus-MTP exclusion is a measurement gap, not a law, and the
1,088 MiB quantized-draft arm is recorded as unmeasured.

Seam: tests/frank_zealot_unit.bats re-pins the shape contract (2 slots,
524,288 pool, 262,144 per slot) and adds a VRAM fit gate that computes
dtype x pool + the measured non-KV ledger terms against 24,123 MiB with
>=1 GiB of slack -- and proves the gate REFUSES exact KV at the old
pool, so passing means something. 18/18 green.

scripts/frank-zealot.service

@@ -1,5 +1,5 @@
 [Unit]
-Description=llama.cpp (PrismML build 10777) Ternary-Bonsai-2-9B PQ2_0-MTP GGUF (qwen35 hybrid, 3x262144 slots over one 786432 pool, q8_0 K+V, MTP off, mmproj Q8_0 vision) on the RTX 3090 (dankclaw, frank-zealot)
+Description=llama.cpp (PrismML build 10777) Ternary-Bonsai-2-9B PQ2_0-MTP GGUF (qwen35 hybrid, 2x262144 slots over one 524288 pool, unquantized f16 K+V, MTP off, mmproj Q8_0 vision) on the RTX 3090 (dankclaw, frank-zealot)
 After=network-online.target
 Wants=network-online.target