test(api): gated live Ollama smoke (--run-live) + env docs

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

api/.env.example

@@ -9,3 +9,10 @@ REPLICATE_API_TOKEN=
 
 # Port the proxy binds. compose / fly.io override this.
 PORT=8000
+
+# Narrator model (charter §5 "the good model"). qwen3.x runs with thinking OFF.
+OLLAMA_NARRATOR_MODEL=qwen3.5:latest
+# Per-attempt model-call timeout (seconds).
+OLLAMA_TIMEOUT_SECONDS=30
+# Optional: append call logs (JSON lines, §10) to this file instead of stdout.
+CALL_LOG_PATH=