collaboration_share and collaboration_access_request (requesters see only
table and id; non-readers get a notification without record data);
collaboration_task with reminders and overdue notices, Mark done/Reopen;
collaboration_record_assignment with Assign to / Take ownership bulk
actions; MyWorkService summary (open tasks, records assigned, unread
mentions); home cards; parent cleanup.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>