Each project folder gets a .env file holding only the keys that project needs, and a .gitignore line that keeps git away from it. The code reads names and never values. In Python, load_dotenv from python-dotenv copies the file into the environment, Node has had a built-in --env-file flag since version 20.6, and uv run takes --env-file too. Commit a .env.example beside it with the names and empty values, so whoever opens the project next knows what it needs.
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