Function buildTrace

Returns {
    agentId: string;
    amc_trace_v: 1;
    event:
        | "tool_result"
        | "llm_call"
        | "llm_result"
        | "tool_intent"
        | "verification_step";
    hashes?: { input_sha256?: string; output_sha256?: string };
    model?: string;
    note?: string;
    providerId?: string;
    receipt?: string;
    request_id?: string;
    ts: number;
}