fix: skip unavailable agenda files in the async fetch child

A vanished org-agenda-files entry hit org's interactive "[R]emove from list or [A]bort?" recovery prompt inside the -batch child, which blocked forever. The overlap guard then turned every subsequent check into a silent no-op and the modeline froze on a stale countdown. org-agenda-skip-unavailable-files makes org skip the missing file with a message instead.

0 files changed, 0 insertions, 0 deletions