feat(frank-archon): raise the pinned host pool; the campaign inherits the step

frank-archon.env: HOST_POOL_MIB 49,152 -> 66,560 a rank (tp x 65 GiB against the
246 GiB the box has), and the TTM pair 162,000/204,800 -> 197,000/224,000 — the
floor the bats ledger formula computes at the new pool. The pool is the KV lever
under the budget resolver: every MiB pinned in host RAM lowers the expert floor on
the card one-for-one and the cache takes it.

scripts/run-qwen38-bf16.sh: the campaign's private FRANK_QWEN38_MNBT (1,024) is
gone — MNBT now comes from FRANK_ARCHON_MAX_BATCHED_TOKENS, production's 2,048 and
the widest step the quantised expert file tiers stream. That 1,024 was PR #80's
answer to a starved cache; the pool is the fix, a narrow step was the symptom's
disguise, and a per-mode literal measures a shape nothing serves.

tests: frank_archon_unit greps the new pool value; qwen38_reference's SHAPE fixture
carries it, and the two MNBT-override tests become the inheritance assertion (every
mode's argv quotes the value the env file owns) plus the calib assertions.

vault: the shape block moves to the new numbers and the Eras table gains the row for
the era this replaces. The 2026-10-20 boot-ledger line stays as the old era's record
until the new boot's ledger replaces it.

scripts/frank-archon.env

@@ -74,7 +74,12 @@ FRANK_ARCHON_PLACEMENT=expert_tiered
 # residency -- ~3.2 GiB a card of experts now lives in host RAM and is read over the
 # x8 link when the router picks it. The ledger's coverage line is the referee, not
 # this file: if vram_kv comes back under 700,000 tokens, raise this 1024 and redeploy.
-FRANK_ARCHON_HOST_POOL_MIB=49152
+# 2026-10-29: 49,152 -> 66,560 (tp x 65 GiB, inside the 246 GiB the box has). The
+# campaign rig's bf16 container at the shared step reported "kv cache 269.99 MiB a
+# card: 7436 tokens", so 682 of the 1,294 calibration documents were refused at that
+# pool; the pool, not the step, is what widens it (scripts/run-qwen38-bf16.sh). The
+# new cache line belongs to the next boot ledger, not to this comment.
+FRANK_ARCHON_HOST_POOL_MIB=66560
 # VRAM left unclaimed per card (publisher default 96 MiB); the engine's settle
 # floor is built from it.
 FRANK_ARCHON_GPU_HEADROOM_MIB=96
@@ -137,9 +142,10 @@ FRANK_ARCHON_NGRAM_PLACEMENT=ram
 # itself before refusing by name, so recovery is a boot, not a visit.
 # Floor = 2 x HOST_POOL + 48,824 (static weights + arena) + PREFIX_CACHE + MNBT + the
 # auto checkpoint store (MAX_SEQS x 10 slots of 111.98 MiB), per the bats ledger test;
-# at the 49,152 pool with 4 slots that computes to 161,848 MiB.
-FRANK_ARCHON_TTM_MIN_MIB=162000
-FRANK_ARCHON_TTM_TARGET_MIB=204800
+# at the 66,560 pool with 4 slots that computes to 196,664 MiB (161,848 at the old
+# 49,152 pool).
+FRANK_ARCHON_TTM_MIN_MIB=197000
+FRANK_ARCHON_TTM_TARGET_MIB=224000
 # Escape hatch for experiments. Unset -> no extra argv; the serve script expands
 # this unquoted on purpose, so keep multi-flag values as one string.
 FRANK_ARCHON_EXTRA_ARGS=