I have been testing your template and I loved it. Very simple, very nice. One common workflow that I use for developing python packages is to install a package in editable mode (PEP 660). This workflow can be easily encoded in the Makefile adding these two lines:
editable:
uv tool install --editable .
The command name could be different. Examples: editable-install, install-editable. What do you think about it? I can make a PR if you want to incorporate this in the project.