It seems possible and natural to allow browsing lei/store as
a Maildir (as well as read-write JMAP/IMAP store).
#'reorder-local-store-and-break-history' => [ '[REFNAME]',
# 'rewrite git history in an attempt to improve compression',
# qw(gc!), @c_opt ],
+#'fuse-mount' => [ 'PATHNAME', 'expose lei/store as Maildir(s)', @c_opt ],
#
# internal commands are prefixed with '_'
'_complete' => [ '[...]', 'internal shell completion helper',