(These are the market notes on today's action by Mike Santoli, CNBC's Senior Markets Commentator. See today's video update from Mike above.) There aren't many reasons to believe this market pullback is the Big One, but might it become a bigger one? The setup entering the week opened the way to some retrenchment: The S & P 500 registered its most overbought reading in 14 months just as momentum was waning and market breadth was flagging. The rally had fed fully off the known positive catalysts of a Fed cutting rates in a steady economy, with the AI-investment theme running hot but losing its power to impress. Seasonal patterns suggested caution, with some supportive flows and options positions due to roll off. Still, the slippage in the indexes has so far been orderly and modest. While the

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