during install i emerged grub. then i changed my mind and ran 'emerge unmerge grub'. during the unmerge the /boot mountpoint was deleted. /boot/.keep should exist to prevent this.
az, baselayout issue?
Well, not really. Baselayout creates /boot in pkg_postinst(), and also the /boot/boot symlink. It should be in theory thus not get unmerged, except if grub touch the /boot/boot symlink ....
Added a .keep.