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- Historical references to the OLD frank-small (FreeToken/CUDA on the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/frank-primary-llamacpp-qwen38-flash-next-q8.md

@@ -254,7 +254,7 @@ refetch.
 
 - [[frank-large-unsloth-qwen38-27b-q8xl]] — Dankclaw :7770, the same
   b11030-mix binary family on gfx1151.
-- [[frank-small-gemma4-12b]] — Dankclaw :7771, mainline llama.cpp on the
+- [[frank-secondary-gemma4-12b]] — Dankclaw :7771, mainline llama.cpp on the
   3090; the only audio-capable endpoint.
 - The harness contract lives in `/home/blank/.omp/agent/models.yml`
   (`llamacpp (dankserver)` provider, `contextWindow 262144`,