rename frank-small → frank-secondary (Dankclaw llama.cpp :7771)

Cross-cutting rename of the current llama.cpp endpoint on the RTX 3090
(port 7771) from frank-small to frank-secondary:

- Service trio: scripts/{frank-small.env,frank-small.service,
  serve-frank-small.sh,download-frank-small.sh} → frank-secondary.*
- Test: tests/frank_small_unit.bats → tests/frank_secondary_unit.bats
- Runbooks: serverAppConfigs-docs/LLM/frank-small-*.md →
  frank-secondary-*.md (9 files); the FreeToken runbook stays
  freetoken-frank-small.md (it documents the retired CUDA-era service)
- Identifiers: FRANK_SMALL→FRANK_SECONDARY, llm_small→llm_secondary,
  LLM_SMALL_*→LLM_SECONDARY_*, deploy_llm_small→deploy_llm_secondary
- Historical references to the OLD frank-small (FreeToken/CUDA on the
  3090, and the Dankserver service that became frank-medium) are
  preserved verbatim — they describe what the service was called
  at the time.

serverAppConfigs-docs/LLM/x4-pair-experiment.md

@@ -249,13 +249,13 @@ distinguishes a real split from a mislabelled sweep.
 
 The fleet's answer is unchanged — **two independent endpoints**
 ([[halogen-flash-server]] on the iGPU via halogen,
-[[frank-small-qwen38-gsq-rco]] holding a whole 27B in the 3090's 24 GB) — but two
+[[frank-secondary-qwen38-gsq-rco]] holding a whole 27B in the 3090's 24 GB) — but two
 claims from the first round of this experiment are now corrected:
 
 1. **Cross-vendor layer split is possible** (measured: CUDA0 + Vulkan1, 27.23
    tok/s and 268.5 t/s prefill at 64k). It is not a regime change (+7 % decode),
    and it costs the 3090 ~15 GiB — which this fleet spends on the vision endpoint
-   (`frank-small` holds 22.4 of the card's 24.6 GiB). An operator who wants the
+   (`frank-secondary` holds 22.4 of the card's 24.6 GiB). An operator who wants the
    7 % must give up the fleet's only image-capable endpoint.
 2. **Per-tensor placement across two devices is impossible while `-ot` is used**,
    for a scheduler-mechanical reason, regardless of driver or vendor mix.
@@ -309,8 +309,8 @@ Operational notes for the next run:
   `GGML_CUDA_NO_PINNED_WEIGHTS`. Without it a CPU-overridden tensor can land in a
   pinned `CUDA_Host` buffer — the 2026-09-15 108 GiB page-lock that starved this
   host's co-tenants.
-- `systemctl mask` is **refused** for a relinked root unit: frank-small's
-  `/etc/systemd/system/frank-small.service` is a symlink into the repo, so
+- `systemctl mask` is **refused** for a relinked root unit: frank-secondary's
+  `/etc/systemd/system/frank-secondary.service` is a symlink into the repo, so
   `mask` exits with "File ... already exists". Stop it and rely on the absence
   of a restart trigger, or move the symlink aside.
 - Restarting frank-large needs the quadlet source back in