Add an error-accumulating Validated container

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What this task asks for

Add a Validated container that accumulates errors while preserving standard container APIs. The from_failure classmethod must wrap a single error into a 1-tuple so accumulation works uniformly. When apply combines two Invalid containers, the resulting error tuple must be self's errors concatenated with the other's errors, preserving stable left-to-right order. The from_validated classmethod must return the same instance it receives. The alt method on Invalid must apply the provided function to each individual error element in the tuple, returning a new Invalid with the mapped results. Valid and Invalid must support structural pattern matching via __match_args__. The decorator must preserve the wrapped function's name.