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Feature: Support for stamped blackboard entries and update-aware decorators

Feature: Support for stamped blackboard entries and update-aware decorators: a task in LegoFlow-SWE (Harbor dataset). The blackboard should expose a new method getStamped that returns the stored value along with its current metadata. Tree nodes should be able to retrieve input ports with this…

The task

The blackboard should expose a new method `getStamped` that returns the stored value along with its current metadata. Tree nodes should be able to retrieve input ports with this metadata as well, by using the existing `getInput` method (or a variant thereof) to obtain a stamped result.

Part of Lego-X/LegoFlow-SWE.