docs(frank-archon): work-log entry and the 4-way capacity probe

Probe on the live service: four concurrent 196,960-token chats, 4/4 exact
marker retrieval, 787,842 tokens in 238.4 s (3,305 t/s aggregate prefill = the
single-stream ceiling, so the four streams shared one pipeline and the KV pool
never ran short); prefix-cache repeat answered in 1.0 s with cache_n=43008.
Recorded with the caveat that 8 generated tokens do not make a decode rate.

serverAppConfigs-docs/log.md

@@ -1,5 +1,44 @@
 # Bundle Change Log
 
+## 2026-10-13
+- **frank-archon outage: a kernel knob, not the model.** The 2026-10-12 23:17
+  power failure on dankserver reset `/sys/module/ttm/parameters/pages_limit`
+  from the manual 200 GiB raise back to its default (half of RAM = 125,988 MiB),
+  below the ~147 GiB pinned-RAM ledger the engine needs; the serve script's
+  preflight named the refusal and exited 1, and `Restart=always` re-ran it
+  **6,919 times in ~20 h** — `activating (auto-restart)`, exit 1 in 50 ms, no
+  container, no engine log. Law adopted: **a sysfs raise is a countdown to the
+  next reboot**, so the gate raises the knob itself. New
+  `scripts/ttm-preflight.sh` is sourced by the serve script (verify, raise,
+  re-verify, then refuse by name) and is also the unit's
+  `ExecStartPre=+…--raise` root hook — `+` because the service is `User=dank`
+  and the knob is root-owned 0644, which is what the first attempt (a plain
+  write inside the serve script) got wrong. `FRANK_ARCHON_TTM_TARGET_MIB=204800`
+  records the host ceiling.
+- **Shape: 4 × 200,000 with fp8 KV (Frank's call).** `--max-num-seqs 4`,
+  `--kv-cache-dtype fp8`, pool and slab untouched (6,912 / 22,208 MiB = the
+  measured 29,120/card ceiling): the pool must back `seqs × max-model-len`, and
+  at bf16 four slots cost 11,679 MiB, which would cut the resident expert slab
+  to 17,441 (−33 %) — fp8 costs 6,601 and leaves it alone. 4 × (1 + spec 2) = 12
+  fused-all-reduce rows, inside the 25-row bound where `wht6` is bit-exact.
+  `models.yml` needed no change: the per-request window is unchanged, only the
+  concurrency.
+- **Deployed at `bae78e7`, gates green.** Boot ledger: `kv cache 6.75 GiB …
+  backs 4 sequences all at 200000 tokens at once` — 843,276 tokens against the
+  sizing law's 843,566 (0.03 %), sampler at 12 rows, weights filled to 147 KiB
+  of slack, cards ~2 GiB free, KV lending 5.87 GiB to the slab. Live probe
+  (now reading the shape from the deployed env): four concurrent 196,960-token
+  chats, **4/4 exact marker retrieval**, 787,842 tokens in 238.4 s = 3,305 t/s
+  aggregate prefill, no preemption; prefix cache verified (repeat answered in
+  1.0 s, `cache_n=43008`). Playwright e2e 32 passed + 1 flaky (the known Plex
+  homepage retry); archon bats seam 21/21 including three new ttm-gate tests.
+- **Power-failure casualties, NOT fixed (outside the archon window):**
+  `mnt-md0.mount` failed at boot, so `/mnt/md0` is an empty mountpoint (the
+  raid6 array itself is healthy, 7/7; fstab has `nofail` so boot continued) —
+  media libraries on it read empty. `frank-job-digest.service` (frankbook
+  job-hunt digest) is in `list-units --state=failed`.
+
+
 ## 2026-10-10
 - **Fleet service rename: the StarCraft names became the SERVICE names.**
   The 2026-10-09 wire alias moved onto every repo artifact: units, serve