getSessionMetrics method

@override SessionMetrics getSessionMetrics()

Get session metrics including token usage and performance stats.

FFI (LiteRT-LM): Returns accurate token counts from benchmark info. MediaPipe (Mobile): Returns estimated counts (uses internal metrics if available).

Call this after getResponse or getResponseAsync completes for accurate results.

Implementation

@override
SessionMetrics getSessionMetrics() {
  // Web MediaPipe implementation doesn't expose detailed token metrics.
  // Users can estimate using sizeInTokens() before/after generation.
  return SessionMetrics();
}