Runtime
Runtime is the part of Beetry that turns a behavior tree from a structural model into an executable system.
To understand runtime, the first step is to understand how a tree is modelled: what kinds of nodes exist, how they are arranged in a hierarchy, and what role each node plays in the overall behavior.
Once that model is clear, the execution model explains how the tree is ticked over time, how nodes report their status, and how progress is coordinated through the tree.