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- Historical references to the OLD frank-small (FreeToken/CUDA on the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.

scripts/frank-large.env

@@ -42,7 +42,7 @@
 #     weights ~62 GiB resident + KV 10.7 + arena (HALOGEN_MAX_TOK=8192 =>
 #     ~8 GiB per FLAGS.md arena formula 3.8+8.4*(MT/16384)) + vision ~2
 #     = ~82.7 GiB engine-side; HALOGEN_HOST_RESERVE_GIB=20 keeps the host
-#     honest; baseline co-tenancy (frank-small, ComfyUI, Caddy/observ)
+#     honest; baseline co-tenancy (frank-secondary, ComfyUI, Caddy/observ)
 #     ~10-15. ~18 GiB margin. The boot ledger is the referee — read it
 #     after deploy and re-size if the engine prints a clamp.
 #   HALOGEN_SPEC_ADAPT=0 is MANDATORY (card): the default adaptive policy