ci: drop support for free-threaded Python versions

Main issue being free-threaded 3.13 and 3.14 triggering use of LLVM 18,
which llvmlite does not support (either 15.X, or 20.X), for the Ubuntu
builds. Windows and MacOS triggers a build process, and fails to
finalize configuration in llvm-config.cmake.

Since use of free-threading is relatively fringe in 2026, dropping
support for these is appropriate.

Author: pyuxiang

.github/workflows/format-check.yaml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.13t', '3.14', '3.14t']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
 
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
@@ -65,6 +65,4 @@ jobs:
           uvx --python 3.11 --isolated --with-editable . pytest
           uvx --python 3.12 --isolated --with-editable . pytest
           uvx --python 3.13 --isolated --with-editable . pytest
-          uvx --python 3.13t --isolated --with-editable . pytest
           uvx --python 3.14 --isolated --with-editable . pytest
-          uvx --python 3.14t --isolated --with-editable . pytest

README.md

@@ -10,10 +10,11 @@ pip3 install fpfind
 
 Requirements:
 
-* Python 3.8 and above, running in Linux
+* Python 3.8+ in Linux x64/ARM64 (and compatibility with Windows x64 and MacOS Apple Silicon)
 * `gcc` (if running `freqcd`, preferably in PATH for auto-compilation)
 
 The stable releases are tagged and listed [here](https://github.com/s-fifteen-instruments/fpfind/tags).
+Free-threaded Python is currently unsupported.
 
 ## Usage
 

pyproject.toml

@@ -16,6 +16,8 @@ classifiers = [
   "License :: OSI Approved :: GNU General Public License v2 (GPLv2)",
   "Natural Language :: English",
   "Operating System :: POSIX :: Linux",
+  "Operating System :: MacOS",
+  "Operating System :: Microsoft :: Windows",
   "Programming Language :: Python :: 3",
   "Topic :: Scientific/Engineering :: Physics",
 ]