Fun with uv and PEP 723

So far I've only run into one minor ergonomic issue when using `uv run --script` with embedded metadata which is that sometimes I want to test changes to the script via the Python REPL, but that's a bit harder to do since you have to run something like:

  $ uv run --python=3.13 --with-requirements <(uv export --script script.py) -- python
  >>> from script import X

I'd love if there were something more ergonomic like:

  $ uv run --with-script script.py python

Edit: this is better:

  $ "$(uv python find --script script.py)"
  >>> from script import X

That fires up the correct python and venv for the script. You probably have to run the script once to create it.