April 2026 monthly summary for OpenHUTB/nn focuses on introducing a MuJoCo-based 4-DOF arm simulation, improving cross-platform reliability, and improving onboarding through documentation. Key actions: - Implemented a MuJoCo-based 4-DOF arm simulator with Windows path fixes and configuration management enhancements, including project structuring changes (created dua_arm) and cleanup (removed legacy src/dua_arm). - Commissioned initial project README as part of the 4-DOF arm simulation project, improving onboarding and collaboration. Major bugs fixed: - Resolved Windows path-related issues causing MuJoCo model load failures with non-ASCII paths. - Fixed YAML module missing error in the configuration flow, enabling stable environment setup. Overall impact and accomplishments: - Delivered a cross-platform, ready-to-prototype arm simulation environment, enabling faster robotics prototyping and testing. - Enhanced developer onboarding and collaboration through a clearly organized repository and an initial README. - Freeing up time for engineers to focus on feature development rather than environment setup. Technologies/skills demonstrated: MuJoCo, Windows path handling, YAML configuration, repository organization, documentation, and cross-functional collaboration.