Add Click constraints support to Hatch GitHub action.

The GitHub action now automatically detects and uses pip constraints from
.auxiliary/configuration/hatch-constraints.pip when installing Hatch. This
allows projects to work around upstream dependency conflicts like the Click
8.3.0 breaking changes that broke Hatch (pypa/hatch#2050).

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: emcd

.auxiliary/configuration/hatch-constraints.pip

@@ -0,0 +1,8 @@
+# Pip constraints file for Hatch installation
+#
+# Click 8.3.0 introduced breaking changes that broke Hatch
+# See: https://github.com/pypa/hatch/issues/2050
+#
+# Remove this constraint once Hatch releases a fix
+
+click<8.3.0

.github/actions/python-hatch/action.yaml

@@ -29,5 +29,10 @@ runs:
       shell: bash
 
     - name: Install hatch
-      run: python -m pip install hatch
+      run: |
+        set -eu -o pipefail
+        if [[ -f '.auxiliary/configuration/hatch-constraints.pip' ]]; then
+          constraints='--constraint .auxiliary/configuration/hatch-constraints.pip'
+        else constraints=''; fi
+        python -m pip install ${constraints} hatch
       shell: bash