Make final discontinuation changes

[pentschev]

This is expected to be the last commit to UCX-Py. It updates the README and docs warnings to inform users that UCX-Py has been permanently discontinued. Along with it, this change removes CUDA 13 mentions from docs, since there will be no CUDA 13 packages released for UCX-Py, however, the functional changes to allow building with CUDA 13 are kept should those be needed for any reason in the near-term.

[jameslamb]

If I've understood the plan correctly, I think we also need to update the version here:

ucx-py/docs/source/conf.py

Lines 22 to 26 in 51f87cd

	# The full version, including alpha/beta/rc tags.
	from ucp import __version__ as release
	# The short X.Y version.
	version = ".".join(release.split(".")[:2])

To a hard-coded:

version = "0.45.0"

Otherwise, when we merge this branch to main and build docs from there, the docs will say 0.46.0 for the version wherever Sphinx puts it, like in the tab titles:

[jameslamb]

Since we're not planning to release ucx-py-cu12==0.46, anyone running these instructions will get ucx-py-cu12==0.45.

ucx-py-cu12==0.45 packages are pinned to not allow UCX 1.19:

ucx-py/dependencies.yaml

Line 197 in d0a58d3

- libucx-cu12>=1.15.0,<1.19

So I think something needs to be done here.

If the plan is to merge this into branch-0.46 and then branch-0.46 into main and then archive the repo, and for these docs to be the ones users find at https://ucx-py.readthedocs.io/en/latest/, then I think we need to also revert any docs changes about UCX 1.19, back to the range support by 0.45.

I think you may just want to do this on your PR branch:

git checkout branch-0.45 -- docs/

And then just manually re-add the warning added in #1167

[pentschev]

Now I understand your point, previously I thought about this but thought it wasn't necessary because we can support 1.19.0, but I didn't think about pins in the 0.45 packages.

[jameslamb]

Suggested change

	> UCX-Py has been discontinued, version 0.45 (RAPIDS 25.08) was its last release and it will receive no further updates. Projects depending on UCX-Py are advised to migrate to [UCXX](https://github.com/rapidsai/ucxx) immediately. [UCXX documentation](https://docs.rapids.ai/api/ucxx/nightly/).
	> UCX-Py has been discontinued, version 0.45 (RAPIDS 25.08) was its last release and it will receive no further updates. Projects depending on UCX-Py are advised to migrate to [UCXX](https://github.com/rapidsai/ucxx) immediately. [UCXX documentation](https://docs.rapids.ai/api/ucxx/nightly/). For more details, see https://docs.rapids.ai/notices/rsn0050/.

I think we should add a link to the RSN. That's helpful in teaching RAPIDS users that that's a section of the docs they should watch for breaking changes like this.

I've been doing that elsewhere, for that reason:

• add note about the repo being archived pynvjitlink#155
• add note about the repo being archived [skip ci] cuspatial#1574

[pentschev]

Done with a slightly reorder in phrasing, see 64f73f8, let me know if you prefer your phrasing/ordering instead.

[jameslamb]

Looks totally fine to me, all I cared about is getting the RSN link in there somewhere. Thanks!

[pentschev]

If I've understood the plan correctly, I think we also need to update the version here:

ucx-py/docs/source/conf.py

Lines 22 to 26 in 51f87cd

	# The full version, including alpha/beta/rc tags.
	from ucp import __version__ as release
	# The short X.Y version.
	version = ".".join(release.split(".")[:2])

To a hard-coded:

version = "0.45.0"

You're right, sorry I forgot about this!

[pentschev]

Thanks @jameslamb , I think I've addressed everything now, please have another look when you have a chance.

[jameslamb]

Changes are looking good to me, thank you!

[pentschev]

Just realized one more thing that we want to change, which is the minimum UCX version, which is 1.15.0 in 0.45. Applied that change now in 4e88e63 .

[jameslamb]

/merge