MSW BehaviourTree

End-to-end authoring skill for MSW .behaviourtree files. Owns both the project-specific authoring spec (<ProjectRoot>/.behaviourDocs/bt-spec.md) and the tree generation itself. Fixed graph rules and skeletons live in this skill's references/; the per-project spec is (re)built by this skill's local scripts/build-spec.cjs.

🚦 Execution order (follow this sequence)

0. Build / refresh the project spec (bt-spec.md)

The spec is the source of truth for every project-specific data point: each custom action/decorator node's definitionId, btNodeType, visible propertyKey names, and the serialized Type.type strings stamped to this project's CoreVersion.

When to (re)build: