SAN FRANCISCO — It doesn’t matter where a team resides in the standings. The trade deadline creates anticipation in every major-league clubhouse.That anticipation comes in different flavors. For contending teams, the mood is pretty straightforward: the hopeful giddiness of a fourth grader on Christmas Eve, wondering what infusions of talent will await them under the tree.For also-rans like the San Francisco Giants, it’s a little more complicated. The players most likely to be dealt, primarily the impending free agents, can look forward to a 20-game jump in the standings and the prospect of playing meaningful baseball again while platforming themselves for another contract — even if decorum requires they keep their eagerness under wraps. The players less likely to be traded, either because they are inexpensive or underperforming, have their guard up as well because they know anything can happen.Then there are players like Giants outfielder Grant McCray, who are equipped with a wealth of tools and a wellspring of confidence and feel they only need a stretch of runway in the big leagues to take off. If the trade deadline takes one player out of the Giants’ orbit, perhaps that’ll change the weather patterns — and the opportunities — for everyone else.But the trade deadline isn’t the only catalyst for change. There are all the standard wobbles in a 162-game season that can happen at any moment, and as Casey Schmitt experienced Monday night, some of them are crueler than others.