fix(ci): use env var for anaconda token instead of CLI arg

Newer anaconda-client versions reject the --token CLI argument with
"invalid file_or_token value". Switch to ANACONDA_API_TOKEN env var
which is recognized automatically by both anaconda-client and
conda-build, bypassing the stricter CLI validation.

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

Author: cwebster2

.github/workflows/publish-conda.yml

@@ -24,12 +24,12 @@ jobs:
           conda-channels: anaconda, conda-forge, cwebster2
       - name: Build
         env:
-          ANACONDA_TOKEN: ${{ secrets.ANACONDA_TOKEN }}
+          ANACONDA_API_TOKEN: ${{ secrets.ANACONDA_TOKEN }}
           PACKAGE_VERSION: ${{ github.event.release.tag_name || '' }}
         run: |
           if [ -z "$PACKAGE_VERSION" ]; then
             export PACKAGE_VERSION=$(cat VERSION | tr -d '[:space:]')
           fi
           conda install conda-build anaconda-client
           conda config --set anaconda_upload yes
-          conda-build --token $ANACONDA_TOKEN .conda
+          conda-build .conda