Triage model (LLM_MODEL) handles every message cheaply. If toxicity >= 0.25, off_topic, or coherence < 0.6, the message is re-analyzed with the heavy model (LLM_ESCALATION_MODEL). Chat, image analysis, /bcs-test, and /bcs-scan always use the heavy model. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>