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* fix(config): sync _memory_config with AppConfig auto-reload get_memory_config() now calls get_app_config() before returning the cached _memory_config singleton. get_app_config() auto-reloads when the config file signature changes, and its _apply_singleton_configs() calls load_memory_config_from_dict() to populate _memory_config. Without this side effect, changing memory.mode in config.yaml (e.g. from "middleware" to "tool") would never take effect at runtime because _memory_config retained the stale value. Only call get_app_config() when _app_config has already been loaded to avoid picking up a config file as a side effect of the first access to get_memory_config(), which would break callers that expect module-level defaults (e.g. unit tests). Catch FileNotFoundError for environments without a config file. Closes #4204. * fix(memory): broaden config-reload guard and add isolated-path tests Addresses two review findings from willem-bd: 1. Broken-config crash risk: broaden the except from FileNotFoundError to Exception so transiently broken config.yaml (YAMLError, ValidationError, ValueError) falls back to the last-good singleton instead of crashing per-turn hot paths (memory_middleware, summarization_hook, lead_agent/prompt.py). 2. Missing regression test: add test_get_memory_config_self_syncs_... (calls get_memory_config() after file mutation with no intervening get_app_config() call) and test_get_memory_config_falls_back_on_... (verifies broken config does not crash, returns cached value).