LangGraph + ACP Structured Message Bus: Planner-Executor-Validator Pattern with SQLite Persistence and JSONL Audit Trail

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A production multi-agent architecture combining LangGraph with ACP-style message schemas routes all inter-agent communication through a centralized Pydantic-typed message bus rather than direct agent-to-agent calls — achieving full traceability, modularity, and failure recovery. The three-agent pattern (Planner → Executor → Validator) uses SQLite-backed persistence so any agent can resume mid-execution after a crash without replaying the full graph. Every interaction is logged in JSONL format with sender, receiver, and message type for production observability.