Unless there are particular security requirements, what role is given to users that perform request fulfillment work?

The itil role is the baseline role in ServiceNow that grants the necessary permissions to work on tasks, incidents, requests, and other ITSM records, and it is the role assigned by default to fulfillment agents unless security requirements demand a more restrictive custom role.

task_worker is not a standard out-of-the-box ServiceNow role used for request fulfillment personnel.

sc_fulfiller is not a standard ServiceNow role name for general request fulfillment workers.

catalog_fulfiller is not a recognized out-of-the-box ServiceNow role for this purpose.

fulfiller is not a standard ServiceNow role name and does not exist as a base system role.