A Walmart store in Martinez, CaliforniaBloomberg/Getty ImagesCode Puppy creator Michael Pfaffenberger said in a memo reviewed by Business Insider that he is leaving.The vibe-coding tool has grown to more than 75,000 users at all levels of the company.Code Puppy lets workers code their own software tools, from engineers to hourly store associates.The creator of Walmart's internal vibe-coding tool is leaving the company for AI start-up Pydantic.In…