wheel: assets should install to `site-packages/cynthion/assets`, not `site-packages/assets`

Summary

While trying to create system packages on Linux for Cynthion and for the gateware binaries and bitstreams, I noticed that the cynthion wheels on PyPI currently ship a directory that installs to site-packages/assets (i.e., an immediate subdirectory of site-packages).

I believe this may be a mistake, and that the actual intention was to ship a directory that installs tosite-packages/cynthion/assets, not site-packages/assets.

Expected behavior

assets is a subdirectory of the cynthion package directory, so it can’t clash with another Python package named assets in the same environment.
The function call cynthion.cynthion_assets_directory() returns a directory that exists and contains the assets.
The function call cynthion.find_cynthion_asset('apollo.bin') returns the path name to the apollo.bin asset.

Actual behavior

assets is an immediate subdirectory of site-packages. This might cause a conflict if another Python package named assets is installed in the same environment.
The function call cynthion.cynthion_assets_directory() returns a directory that doesn’t exist.
The function call cynthion.find_cynthion_asset('apollo.bin') returns None.

Steps to reproduce

Create and activate a fresh Python virtual environment. For example on a Linux shell:
```
cd "$(mktemp -d)"
python -m venv .venv
. .venv/bin/activate
```
Install Cynthion v0.1.1 from PyPI:
```
pip install cynthion==0.1.1
```

Confirm that the assets directory is a direct subdirectory of site-packages:

$ ls .venv/lib/python3.*/site-packages/
[…] assets […] cynthion […]
$ ls .venv/lib/python3.*/site-packages/assets/
54-cynthion.rules       CynthionPlatformRev0D2  CynthionPlatformRev0D5  CynthionPlatformRev1D0  CynthionPlatformRev1D3
apollo.bin              CynthionPlatformRev0D3  CynthionPlatformRev0D6  CynthionPlatformRev1D1  CynthionPlatformRev1D4
CynthionPlatformRev0D1  CynthionPlatformRev0D4  CynthionPlatformRev0D7  CynthionPlatformRev1D2  moondancer.bin

Confirm that the cynthion_assets_directory() function returns a non-existent directory:

$ python -c "import cynthion; print(cynthion.cynthion_assets_directory())"
/tmp/yourtempdir/.venv/lib/python3.12/site-packages/cynthion/assets

Confirm that calls to the find_cynthion_asset function return nothing:

$ python -c "import cynthion; print(cynthion.find_cynthion_asset('apollo.bin'))"
None
$ python -c "import cynthion; print(cynthion.find_cynthion_asset('moondancer.bin'))"
None

Note

I haven’t been able to check whether the cynthion CLI command works as intended, because my Cynthion is yet to arrive.
Several people on Discord have reported their setup is working. So what am I missing?

greatscottgadgets / cynthion