Improve code quality, documentation, and nullability annotations#4139

sekkaahmed wants to merge 2 commits intospring-projects:mainspring-projects/spring-kafka:mainfrom

sekkaahmed:claude/improve-implementation-011CUoFDg8oNEReSFbruouYBsekkaahmed/spring-kafka:claude/improve-implementation-011CUoFDg8oNEReSFbruouYBCopy head branch name to clipboard