Monthly summary for 2025-08 (UMEP-dev/SUEWS): Focused on stabilizing the core simulation pipeline through targeted fixes in YAML handling, configuration initialization, and import hygiene. These changes reduced runtime/import errors, improved reliability of simulation runs, and enhanced maintainability of the codebase. Key outcomes include: (1) YAML module naming stability and import path fixes to prevent import errors in the YAML converter, (2) safe initialization of output_config before triggering the simulation function to eliminate uninitialized-variable runtime errors, and (3) simplified and stabilized imports in phase_b_science_check by removing complex try-except logic and using direct imports from supy._env. Impact: Lowered failure risk in production runs, faster debugging, and more predictable CI results. These efforts demonstrate a strong emphasis on robust code hygiene, dependency management, and defensive programming. Technologies/skills demonstrated: Python module import hygiene, configuration initialization patterns, error handling simplification, and YAML-related tooling; strong attention to maintainability and reliability in a data-intensive simulation workflow.