'uv run' makes dependencies availabe on PATH automatically.

AFTER Installing a wheel, uv is not involved, so the console script from j2lint is not installed.

Declare j2lint as a dependency in pyproject.toml so its console script is installed:

[project]

dependencies = ["j2lint"]

{project.scripts]

j2linttest = "j2linttest:main"

After building and installing the wheel, j2lint will be on path and subprocess can find it.