Why: - Design the LangGraph-based insurance chatbot: retrieval-grounded answering, grounded clarification, and handoff to a human assistant owned by the existing main backend. Changes: - ADR-0006: graph nodes/edges, escalation triggers, and the backend-owned handoff signal contract. - ADR-0007: Postgres checkpointer, thread model (thread_id as the shared identifier), history trimming strategy, and cross-thread user memory via the Store. Impact: - Design-only; no code changes yet.
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