feat: refresh the model catalog from live API data at runtime

assets/config-template.yaml

@@ -244,8 +244,13 @@ right_prompt: null               # If null, uses the built-in default:
 # ---- Miscellaneous ----
 user_agent: null                 # Set User-Agent HTTP header, use `auto` for coyote/<current-version>
 save_shell_history: true         # Whether to save shell execution command to the history file
-sync_models_url: null            # URL to sync model changes from. If null, uses the built-in default:
+sync_models_url: null            # Where `--sync-models` and the automatic refresh get model data from.
+                                 # If null, fetches fresh model data from models.dev + OpenRouter.
+                                 # Set a URL to mirror a full models.yaml instead, e.g.:
                                  #   https://raw.githubusercontent.com/Dark-Alex-17/coyote/refs/heads/main/models.yaml
+sync_models_auto: true           # Whether to refresh the model catalog in the background on REPL startup
+                                 # once it goes stale
+sync_models_ttl_hours: 24        # Hours before the synced model catalog is considered stale
 
 # ---- Clients ----
 # See the [Clients documentation](https://github.com/Dark-Alex-17/coyote/wiki/Clients) for more details