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- Historical references to the OLD frank-small (FreeToken/CUDA on the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/Operations/Fleet Audit and Posture.md

@@ -217,7 +217,7 @@ done
 ```
 
 Ground truth (verify, don't assume — IPs can move): 192.168.0.143 = dankclaw
-= AI stack + `frank-large` :7770 + `frank-small` :7771 (RTX 3090 + Strix
+= AI stack + `frank-large` :7770 + `frank-secondary` :7771 (RTX 3090 + Strix
 Halo iGPU); 192.168.0.235 = dankserver = media stack + `frank-primary`
 :7770 (2× R9700). Repo dirs + live hostnames agree; the deploy tooling is
 hostname-anchored (`ssh dankclaw`/`ssh dankserver` via `~/.ssh/config`), so