fix: use workflow run ID for artifact naming

Changes:
- Use github.run_id in analyze workflow artifact name
- Use github.event.workflow_run.id in update workflow download
- This fixes the issue where PR number is not accessible in workflow_run context

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

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

.github/workflows/sync_docs_analyze.yml

@@ -375,7 +375,7 @@ jobs:
         if: steps.analyze.outputs.has_changes == 'true'
         uses: actions/upload-artifact@v4
         with:
-          name: docs-sync-analysis-${{ github.event.pull_request.number }}
+          name: docs-sync-analysis-${{ github.run_id }}
           path: |
             /tmp/analysis.json
             /tmp/changed_files.txt

.github/workflows/sync_docs_update.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Download analysis artifacts
         uses: actions/download-artifact@v4
         with:
-          name: docs-sync-analysis-${{ github.event.workflow_run.event.pull_request.number }}
+          name: docs-sync-analysis-${{ github.event.workflow_run.id }}
           path: /tmp/analysis
           github-token: ${{ secrets.GITHUB_TOKEN }}
           run-id: ${{ github.event.workflow_run.id }}