DeclaresComponents

The contract by which a host declares the components it brings. Discovery is by `instanceof` over the booted plugins, at request time — boot order does not matter and nobody names a plugin, exactly as the admin panel discovers its sections. The framework's own primitives enter through this same interface ({@see \Milpa\Live\Components\Library}): there is no privileged path. It declares CLASSES, not instances, and that is the whole reason it can answer cheaply: {@see ComponentDefinitionInterface::contract()} is static, so a catalogue can read what a component IS without building it, without a registry, and without a request. Registration answers a different question — what this host will PAINT right now — and a name can be registered by one host and declared by another. Kept as a sibling interface rather than a method on {@see ComponentRegistryInterface} so existing implementations stay valid (additive, the shape {@see ListsComponents} already set for greenhouse decisions/0211).

abstract public function declaredComponents(): array

The component definitions this host declares, as class-strings.