December 2025 monthly summary for Redot-Engine/redot-engine: Focused on improving BoneAttachment3D reliability and transform propagation. Delivered a feature: BoneAttachment3D Transform Update and Reliability Enhancement, refactoring the update loop to boost performance and reliability. Fixed a critical bug where BoneAttachment3D failed to update its transform when the associated bone changed (commit a2f6279d7a97ec9f0ea3ea0ae1e4bc4bf2acfb24). Overall, the work improves 3D attachment correctness in dynamic bone scenarios, reducing visual glitches and increasing stability in asset pipelines. Tech/skills demonstrated include advanced 3D transform math, engine update loop optimization, and maintainable refactoring with clear commits.