Cloud directory sync warns when a turn waits over a minute

If a turn is held more than a minute waiting for your machine's upload or for the file sync service, you now get a report line, Claude is told about the delay, and a warn-level event dir_sync_git_turn_held_long is recorded with the minutes waited and what was being waited on. The older "about N MiB still downloading" message was dropped in the same rewrite.