[$] The beginning of the 6.13 merge window

As of this writing, just over 1,800 non-merge changesets have been pulledinto the mainline kernel for the 6.13 release. That number may seem small,given that a typical merge window brings in at least 12,000 commits, butthe early pulls this time around have focused on significant core changes,and there are quite a few of them. The time has come to summarize thechanges pulled so far, including lazy preemption, multi-grained timestamps,new extended-attribute system calls, and more.