LONDON — When King Charles III lands in the U.S. on Monday, his aides will be carrying a heavy ring binder lined with thick, textured paper. Among reams of timings, briefings and biographies will likely be a condensed list of key objectives, the result of months of planning with the British government, expanded upon in the margins with handwritten scribbles from the monarch’s red felt-tip pen. It will not have been easy to write. Trump had already strained his relationship with British Prime