Semantic retrieval now defaults to auto-detection, enabling local embedding-based ranking whenever a runtime is reachable, while gracefully falling back to lexical search as a healthy state. This release introduces a resilient Runtime availability decorator that protects the server from runtime outages and provides actionable diagnostics via doctor and index status. These changes replace the previous opt-in model, ensuring that Memento leverages semantic context automatically on capable machines without sacrificing utility when a runtime is absent.