Send a chat message

Send a visitor message through the full multi-agent pipeline: triage classifies intent, query agents retrieve grounded context from the product / post indexes (plus any custom domain agents), and response agents synthesise a grounded answer with product cards or cited content. The response is streamed as NDJSON when stream: true (each line is one of { type: "token", ... }, { type: "product", ... }, { type: "done" }), or returned as a single JSON object when stream: false. Pass threadId to continue a conversation (memories and prior turns are loaded); omit it for a fresh one. Respects the workspace's active persona / system-prompt configuration.