fix: move fetch-depth to publish job and use claude-opus-4-5 for changelog

The fetch-depth: 0 was on build-wheels but changelog generation happens
in the publish job. Moved it to the correct location and upgraded the
model for better changelog generation.

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

Co-Authored-By: Claude <[email protected]>

Author: ashwin-ant

.github/workflows/publish.yml

@@ -68,8 +68,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-      with:
-        fetch-depth: 0 # Fetch all history including tags (necessary for changelog generation)
 
     - name: Set up Python
       uses: actions/setup-python@v5
@@ -109,6 +107,7 @@ jobs:
     - uses: actions/checkout@v4
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
+        fetch-depth: 0  # Fetch all history including tags for changelog generation
 
     - name: Set up Python
       uses: actions/setup-python@v5
@@ -188,6 +187,7 @@ jobs:
         prompt: "/generate-changelog new version: ${{ env.VERSION }}, old version: ${{ steps.previous_tag.outputs.previous_tag }}"
         anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
         github_token: ${{ secrets.GITHUB_TOKEN }}
+        model: claude-opus-4-5
         claude_args: |
           --allowedTools 'Bash(git add:*),Bash(git commit:*),Edit'