January 2026 monthly summary for C2SM/spack-c2sm: Focused on establishing release-tag governance to improve release reproducibility and ownership. Delivered policy for creating release tags, clarifying that they are managed by the Spack-Admin GitHub Team and coordinated within the team. This establishes clearer ownership, reduces tagging errors, and sets the stage for scalable governance across future releases. No major bugs fixed this month.

Monthly summary for 2025-12 for repo C2SM/spack-c2sm: Dependency cleanup and testing efficiency improvements focused on ICON package management and dependency elimination.

November 2025: Reintroduced the icon-exclaim package in C2SM/spack-c2sm and added support for halo-exchange and memory allocation libraries. This work improves interoperability, expands runtime configuration options, and strengthens build reproducibility for downstream users. No major bugs fixed this month; the focus was on feature restoration, integration, and aligning with the project roadmap.

March 2025 (C2SM/icon4py) focused on expanding divergence damping capabilities in the non-hydrostatic solver. Delivered the DivergenceDampingType TWO_DIMENSIONAL enum and updated NonHydrostaticConfig to remove NotImplementedError for COMBINED, preparing the system to support the new damping type. This work, backed by commit 7eb26e2f4a5f1ceb671cd18e05b9aa2caf5d77ab (Allow DivergenceDampingType.COMBINED (#688)), lays groundwork for future stability and configurability improvements in the solver. No other major features or bug fixes shipped this month; the changes reduce future integration effort and align with the roadmap for enhanced divergence damping.