Contracts for the S&P 500 Index rose 0.5% after the underlying gauge erased its gains to close 0.2% lower in the final hours of Wednesday trading. Asian shares edged lower after Micron Technology Inc. gave an upbeat forecast, but warned that rising compensation costs would weigh on profit margins. Alphabet Inc.’s shares rose after Google began rolling out the Gemini 4 Argon, its long-awaited flagship artificial intelligence model.