April 2025 monthly summary for leanprover-communityhub.io focusing on documentation governance and deprecation practices. Delivered a new Deprecation sub-section in the style guide to standardize how removed/renamed declarations are deprecated, including aliasing, deprecation messages, and to_additive handling to warn downstream projects and facilitate smoother updates. This work reduces upgrade risk for downstream users and improves maintainability.

January 2025 (2025-01) summary for opencompl/lean4: Delivered a feature expansion in modular arithmetic and prepared the codebase for more robust proofs. Major bugs fixed: none reported for this month. Overall impact: expanded lemma coverage for modular arithmetic, reducing edge-case risks in subtraction reasoning and improving API surface for Lean 4 users. Technologies/skills demonstrated include Lean 4, formal verification practices, and collaborative contribution with clear commit traceability.