BUZZ — US stocks weekly: AI unwind
* S&P 500 drops 1.9% as AI jitters exact a toll.N * Dow adds 0.7%, but tech-heavy Nasdaq Composite sheds 4.5% * Dow tries to build a base, but resistance looms ahead * This as tech's lead over banks faces another test * US 10-Year Treasury yield spikes to as high as about 5.33%, then pulls back to end around 5.09% as i