ZFSPlugin's free_image deletes the zvol via SSH after calling our
run_delete_lu. Our earlier addition of freenas_delete_zvol in
run_delete_lu caused a double-delete: SSH would fail, free_image's
error recovery would call run_create_lu on the now-missing zvol,
producing a spurious "Unable to create lun (rolled back)" in the task
log even though the migration had already succeeded.
freenas_delete_zvol remains in run_create_lu's rollback path where it
correctly cleans up zvols orphaned by a failed LUN creation (#239).
Also documents ZFS blocksize requirements for TrueNAS SCALE (16k) vs
CORE (8k) in README configuration and troubleshooting sections (#241).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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