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- Historical references to the OLD frank-small (FreeToken/CUDA on the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

shared/grafana/provisioning/dashboards/llm-fleet.json

@@ -1,7 +1,7 @@
 {
   "uid": "llm-fleet",
   "title": "LLM fleet \u2014 capacity and reuse",
-  "description": "The signals that explain the LLM endpoints under load. One metric namespace: llamacpp:* across all three endpoints — frank-small (Dankclaw, RTX 3090), frank-large (Dankclaw, gfx1151 iGPU) and frank-primary (Dankserver, 2x R9700, llama.cpp again since the 2026-09-26 swap back from Lucebox DS4.1). The endpoint picker selects between them. See serverAppConfigs-docs/Infrastructure/Observability.md for the namespace split and the addressability rules.",
+  "description": "The signals that explain the LLM endpoints under load. One metric namespace: llamacpp:* across all three endpoints — frank-secondary (Dankclaw, RTX 3090), frank-large (Dankclaw, gfx1151 iGPU) and frank-primary (Dankserver, 2x R9700, llama.cpp again since the 2026-09-26 swap back from Lucebox DS4.1). The endpoint picker selects between them. See serverAppConfigs-docs/Infrastructure/Observability.md for the namespace split and the addressability rules.",
   "tags": [
     "llm",
     "capacity"
@@ -166,7 +166,7 @@
       "id": 5,
       "type": "timeseries",
       "title": "Decode steps and batch size",
-      "description": "Per-step counters: steps per second and the busy-slot count per step (the effective batch). With frank-primary's --parallel 1 the slot count stays at 0 or 1 and says nothing about the card; with frank-small's 4 slots it tracks the agent-fleet burst shape.",
+      "description": "Per-step counters: steps per second and the busy-slot count per step (the effective batch). With frank-primary's --parallel 1 the slot count stays at 0 or 1 and says nothing about the card; with frank-secondary's 4 slots it tracks the agent-fleet burst shape.",
       "gridPos": {
         "h": 8,
         "w": 12,