Durable tasks

agentkernel task run drains queued durable agent tasks using isolated Git worktrees and sandboxes. Each worker claims tasks atomically, so multiple agentkernel processes can safely share the queue.

# Use up to four task workers (the default)
agentkernel task run

# Bound active tasks explicitly
agentkernel task run --parallel 2

The command reports aggregate progress as tasks finish. A task's result is a reviewable diff against its starting commit; failures remain recorded on the task, and Ctrl-C cancels queued and running tasks after their cleanup path has completed. --parallel accepts values from 1 through 64.