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const why = await velaSignal.explain({
  user_id: "usr_8a1f...",
  symbol: "NVDA",
  timestamp: "2023-10-17T14:30:00Z",
  lookback: "60m",
});

// → {
//     headline: "Down 3.4% on expanded U.S. chip export
//      controls — sector-wide, not NVDA-specific.",
//     drivers: [
//       { type: "news", source: "reuters.com/...", w: 0.71 },
//       { type: "corr", peers: ["AMD","AVGO"],    w: 0.22 },
//       { type: "flow", signal: "unusual_puts",   w: 0.07 }
//     ],
//     confidence: 0.92
//   }