Validator FastAgent Config updates

validator/fastagent.secrets.yaml.example

@@ -4,10 +4,11 @@
 # gitignored; the .yaml.example is committed.
 
 # ── LLM provider keys ───────────────────────────────────────────────────────
-# Local llama.cpp doesn't authenticate, but fast-agent requires the key field
-# to be present. "0000" or any non-empty string is fine.
-openai:
-  api_key: "0000"
+# Local llama.cpp on Nyx is served via fast-agent's Generic provider
+# (fastagent.config.yaml: `default_model: generic.…`). The Generic provider
+# injects "ollama" as a placeholder key automatically, so no explicit entry
+# is needed here. If you later point `default_model` at a cloud OpenAI model,
+# add an `openai.api_key` stanza.
 
 # ── MCP server bearer tokens ────────────────────────────────────────────────
 mcp: