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I'm not sure I understand what you're asking in this case. From your question it appeared you were wondering how to use the angles package, once you've installed it (you wrote "ros2-foxy-angles got installed by rosdep from my package.xml").
I don't understand how std_msgs.msg.Float32 is related.
The link to the source repository is displayed on the ROS Index page you already linked. See #q381559.
but nowhere in the source code does anything tell me where ROS2 installs the source code. [..] I'm starting to think Foxy does not support angles in Python.
While there is nothing in the package itself (ie: the actual business code) that would make it impossible to use this package on ROS 2, it does currently not install the Python-side. The setup.py is indeed pre-ament (meaning: catkin).
The angles package installed by rosdep for you is the C++ side.
If you have a need to use functionality right now, you could copy the relevant function(s) from the __init__.py and use them like that.
It would be nicer however if the Python side could be included in the next release.
I would recommend you open an issue on the tracker to discuss what would be needed to get it released. I would expect it would only take an update of the setup.py and perhaps the CMakeLists.txt.
It could also be the maintainers would like to split the Python and C++ versions of the packages. That would require slightly more changes, but would still not be too much work.
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