Fix half plane issues

[steven-murray]

This is some work I'm doing to see if I can fix the half-plane vs full-plane issues. Just a draft for now as I'm working on it between this and the 21cmSense PR.

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[sourcery-ai]

Sorry @steven-murray, your pull request is larger than the review limit of 150000 diff characters

[steven-murray]

@nikos-triantafyllou this is finally ready for review -- there were a couple of small bugs on the 21cmSense side which are now fixed in a PR there (this branch adds the specific 21cmSense branch as a dependency... once you check this and give the all clear, I'll pull the trigger on the 21cmSense PR and update tuesday to depend on an actual 21cmSense version again).

[steven-murray]

@nikos-triantafyllou it looks like it will fail tests until I merge and release the new 21cmSense, but you should be able to install it with uv properly locally (the CI fails because it uses miniconda+pip to handle deps rather than uv, which is fine usually but it doesn't pick up that 21cmSense is pointed to a git url rather than pypi). So, go ahead and look at it and test it out, and if you're satisfied, I'll merge upsteream.

BTW this does not attempt to fix #104 at all -- once this is merged into better_lc_noise, we can work on a fix from there.