The instance's own file (absolute).
Core template name, e.g. punch-list/harvest.task.md;
unset: the instance file is the only source.
The task; undefined only when there is no instance file and
no core template was given (the caller skips).
Resolve a worker's task: instanceFile when it exists, else core's
template.
The instance's own file (absolute).
Optionaltemplate: string
Core template name, e.g. punch-list/harvest.task.md;
unset: the instance file is the only source.
The task; undefined only when there is no instance file and
no core template was given (the caller skips).
Resolve a worker's task:
instanceFilewhen it exists, else core'stemplate.