architect-update-config-safely

Use when changing an agent setting (LLM, voice, TTS model, language, first message, ASR, guardrails, timeouts, turn-taking, data collection, evaluation criteria) and wanting it to actually apply, or on symptoms like "it won't save", "the change didn't take", "schema mismatch", "invalid config", "config validation failed", "set X to Y", or a language/voice change that broke the audio.