fix(ci): publish from an isolated dist/ dir to avoid the action's .github helper

gh-action-pypi-publish drops a .github/.tmp/ helper into the workspace, so packages_dir='.' made its hash step crash with IsADirectoryError on that dir (the v1.1.0 publish failed here; nothing reached PyPI). Download wheels into dist/ and point packages-dir there; add skip-existing for safe retries.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: skilledwolf

.github/workflows/wheels.yml

@@ -144,9 +144,13 @@ jobs:
         with:
           pattern: wheels-*
           merge-multiple: true
+          path: dist
 
       - name: Publish to PyPI (via OIDC)
         if: startsWith(github.ref, 'refs/tags/v')
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
-          packages_dir: .
+          # Isolate wheels in dist/: the action drops a .github/.tmp helper in the
+          # workspace, so packages-dir="." made its hash step choke on that dir.
+          packages-dir: dist
+          skip-existing: true