feat(config): default local model to gemma4:12b via Ollama

- config.yaml: provider ollama, default gemma4:12b
- dynamic_dispatch_optimizer.py: fallback route references gemma4:12b

scripts/dynamic_dispatch_optimizer.py

@@ -23,7 +23,7 @@ def main():
     if fleet.get("ezra") == "OFFLINE":
         print("Ezra (Primary) is OFFLINE. Optimizing for local-only fallback...")
         # In a real scenario, this would update the YAML config
-        print("Updated config.yaml: fallback_model -> local:hermes3")
+        print("Updated config.yaml: fallback_model -> ollama:gemma4:12b")
     else:
         print("Fleet health is optimal. Maintaining high-performance routing.")