rseng-reproducible-environments

Covers making research software environments reproducible: pinning a language version and its dependencies in a per-project virtual environment, choosing a package/environment manager, and packaging code and its full stack into a container. Use when the user asks how to set up venv/conda/poetry/uv/renv, lock or pin dependencies, share a runnable environment, escape "dependency hell" or "works on my machine", write a…