ReadonlyartifactOptional ReadonlybundledSubdirectory of a target artifact that bundles this kind's companion.
Optional ReadonlyfallbackA catch-all: asked only after every other kind declined, wherever it was registered, so a kind added later is still detected ahead of it.
ReadonlykindOptionaldetectWhether the artifact is this kind's. Absent: the kind is chosen only by name. Kinds are asked in registration order.
Load the provider and settle its round width; the provider is owned by the caller on return and disposed here on failure.
False for a model-free kind: it takes no artifact and is chosen only by name.