python-3.14t build

### Solution to issue cannot be found in the documentation.

- [x] I checked the documentation.

### Issue

Is there a way to trigger this build to satisfy the python 3.14 dependency, or does extra internal work in xeus-python need to be done? I have a software (Harpy) who's bioconda build can't pass and the maintainers are asking me to trigger rebuilds in the dependencies for 3.14 compat rather than setting a `python <3.14` upper limit. If not, I can return to the maintainer explaining their suggested solution is not tractable.

Discussion:
https://github.com/bioconda/bioconda-recipes/pull/65792#discussion_r3421253711

### Installed packages

```shell
- altair >=6.0
- bcftools >=1.23
- click >=8.2
- conda >=24.8
- djinn >=2.3
- htslib >=1.23
- jupyter-book >=2.1.0
- papermill >=2.6
- pandas >=2.3.3
- pillow >=12.2
- polars >=1.39
- pysam >=0.23
- python >=3.11
- rich-click >=1.9.3
- samtools >=1.23
- seqtk
- snakemake-minimal >=9.19.0
- vl-convert-python >=1.9.0
- xeus-python >=0.18.1
```

### Environment info

```shell
conda build
```

Start by reading the linked bioconda discussion and reviewing how this feedstock is handled by `conda build` for Python 3.14 compatibility. Determine whether a rebuild can be triggered or whether xeus-python needs additional internal work; done means documenting the supported path or the reason it is not tractable.

Written by the indexing model from the issue text.