FieldKernelsTask

`construct.field.kernels`: the field kernel catalog (field-presentation §FVO-2, §FVK-5, matrix FVW-22).

In the namespace construct::opal. Declared in src/libs/libconstruct/construct/opal/FieldKernelsTask.hpp.

Detailed description

Read only. Without an item it lists every kernel of libfield's catalog: id, label, inputs with their arities, quantities and roles, parameters with their values, unit and sign rules, the default range and marker. With `item`, a tet volume or a mesh whose data is loaded, each kernel also lists its candidate bindings over the item's field set (§FVK-2 rule 3): one field reference per way it binds, or the reason it binds none. A plan reads the references and hands them to the field tasks as they are.

Not FEM-guarded in spirit, but libfield is a FEM-build library, so the task registers with the solve tasks.