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Nominal string types via a unique-symbol brand (zero runtime cost): an AgentId can no longer be passed where a CallId is expected. Each core package brands the IDs it owns — CallId in dsh-llm (tool-call correlation across blocks, chunks, session events, and execution results), SessionId in dsh-session, AgentId in dsh-agent. Construction goes through same-named factory functions; public string-in APIs (sessions.create, agentLoop.create) keep accepting plain strings and brand internally. Policy note in the brand module: brand IDs that cross package boundaries, not every string.