Fix dist root permissions so --sync publishes a readable directory

The dist directory is the swapped-in staging dir, which mktemp -d creates mode
0700. The published album root therefore stayed 0700, so the first `shuriken
--sync` created the remote album directory 0700 and the web server (daemon) could
not read it -- requiring a manual chmod 755 on each mirror.

Relax the staging dir to the umask-default directory mode right after mktemp -d
(what mkdir would have produced), so the dist root matches its subdirectories and
is served/synced with sane permissions. Add a regression test asserting the dist
root mode equals its photos/ subdirectory mode.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions