build: enable free-threaded wheels in cibuildwheel (#121)

* build: enable free-threaded wheels in cibuildwheel

cibuildwheel does not build free-threaded CPython wheels by default, even
when the build pattern matches cp*. As a result, users on 3.13t/3.14t/3.15t
installed pure-Python wheels with no native extension and saw:

    Failed to load instrument hooks library: cannot import name
    'dist_instrument_hooks' from 'pytest_codspeed.instruments.hooks'

Opt in via `enable = ["cpython-freethreading"]` so the cp31{3,4,5}t wheels
ship the compiled dist_instrument_hooks extension.

Co-Authored-By: Claude <noreply@anthropic.com>

* ci: bump pypa/cibuildwheel from v3.2.1 to v3.4.1

v3.2.1 predates CPython 3.14/3.15 support in cibuildwheel. Bumping unlocks
free-threaded 3.14t/3.15t wheel builds (which no longer need the
cpython-freethreading enable flag — only 3.13t does).

Co-Authored-By: Claude <noreply@anthropic.com>

* build: enable cpython-prerelease wheels in cibuildwheel

CPython 3.15 is still in beta, so cibuildwheel will not build cp315 /
cp315t wheels without the cpython-prerelease opt-in. Add it alongside
cpython-freethreading so prerelease wheels (regular + free-threaded)
ship for users testing on 3.15.

Co-Authored-By: Claude <noreply@anthropic.com>

* chore: advertise Python 3.15 support in classifiers

Add the trove classifier for 3.15 now that cibuildwheel ships cp315 /
cp315t wheels.

Co-Authored-By: Claude <noreply@anthropic.com>

* ci: pin cibuildwheel to a main commit with CPython 3.15 support

v3.4.1 does not yet include cp315 in its bundled build-platforms.toml, so
the cpython-prerelease enable flag has nothing to act on. Pin to commit
ec0977e (post-#2833 "add CPython 3.15 beta 1") to unblock cp315 / cp315t
wheel builds. Drop the pin back to a tagged release once cibuildwheel
ships 3.15 metadata.

Co-Authored-By: Claude <noreply@anthropic.com>

* build: drop cpython-freethreading enable group

The cibuildwheel commit we pin (post-#2684) no longer recognizes
cpython-freethreading: 3.13t support was dropped and free-threading is the
default for 3.14+. Keeping the value triggers:

    cibuildwheel: Failed to parse enable group. Unknown enable group:
    cpython-freethreading.

Only cpython-prerelease is still needed (for cp315 / cp315t while 3.15 is
in beta).

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: art049

.github/workflows/release.yml

@@ -28,7 +28,9 @@ jobs:
         with:
           submodules: true
       - name: Build wheels
-        uses: pypa/cibuildwheel@v3.2.1
+        # Pinned to main past v3.4.1 for CPython 3.15 beta support (PR #2833).
+        # Revisit once the next tagged release ships 3.15 metadata.
+        uses: pypa/cibuildwheel@ec0977e5f64e2ec8c1276eea62083c103613b756
         env:
           CIBW_ARCHS: ${{ matrix.platform.arch }}
         with:

pyproject.toml

@@ -25,6 +25,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Topic :: Software Development :: Testing",
     "Topic :: System :: Benchmark",
     "Topic :: Utilities",
@@ -103,6 +104,7 @@ push = false
 
 [tool.cibuildwheel]
 build = "cp*{manylinux,macosx}*"
+enable = ["cpython-prerelease"]
 test-extras = ["build", "test", "compat"]
 test-command = "pytest -v --ignore={project}/tests/benchmarks {project}/tests"