December 2025 monthly summary for wolfi-dev/os. Focused on improving external contributor onboarding and build-system clarity through targeted documentation updates, with an emphasis on business value and technical rigor. Key features delivered: - Documentation Update: Chainguard Customer Support and Build System Cache Explanation. Updated CONTRIBUTING.md to clarify Chainguard customer support scope and improve the explanation of the build system cache. Major bugs fixed: - None reported this month. Overall impact and accomplishments: - Clarified support scope and improved contributor onboarding, reducing ambiguity and potential back-and-forth for external contributors. - Strengthened build-system cache guidance to support faster, more reliable builds and easier troubleshooting. - Aligned contributor guidelines with Chainguard support expectations, helping streamline collaboration and reduce support overhead. - Demonstrated strong technical writing, version control hygiene, and documentation standards in a production repository. Technologies/skills demonstrated: - Technical writing and documentation best practices - Version control and commit hygiene (signed/clear commits) - Build-system concepts and cache explanation - Cross-team alignment and stakeholder communication