Validate fragment types match the expected types

.github/workflows/generate-changelog.yml

@@ -83,11 +83,41 @@ jobs:
             echo "Cannot create a release without changelog entries."
             echo "Add changelog fragments to the changelog/ directory (e.g., 1234.added.md) and try again."
             exit 1
-          else
-            echo "✓ Found $FRAGMENT_COUNT changelog fragment(s)"
-            echo "has_fragments=true" >> $GITHUB_OUTPUT
           fi
 
+          # Validate fragment types
+          VALID_TYPES="added changed deprecated removed fixed security"
+          INVALID_FRAGMENTS=""
+
+          for file in changelog/*.md; do
+            # Skip README and template
+            if [[ "$file" == "changelog/README.md" ]] || [[ "$file" == "changelog/_template.md.j2" ]]; then
+              continue
+            fi
+            
+            # Extract type from filename (e.g., 1234.added.md -> added)
+            filename=$(basename "$file")
+            # Handle both 1234.added.md and 1234.added.2.md patterns
+            type=$(echo "$filename" | sed -E 's/^[0-9]+\.([a-z]+)(\.[0-9]+)?\.md$/\1/')
+            
+            # Check if type is valid
+            if ! echo "$VALID_TYPES" | grep -wq "$type"; then
+              INVALID_FRAGMENTS="$INVALID_FRAGMENTS\n  - $filename (type: '$type')"
+            fi
+          done
+
+          if [ -n "$INVALID_FRAGMENTS" ]; then
+            echo "❌ Error: Invalid changelog fragment types found:"
+            echo -e "$INVALID_FRAGMENTS"
+            echo ""
+            echo "Valid types are: $VALID_TYPES"
+            echo "Example: 1234.added.md, 5678.fixed.md"
+            exit 1
+          fi
+
+          echo "✓ Found $FRAGMENT_COUNT changelog fragment(s)"
+          echo "has_fragments=true" >> $GITHUB_OUTPUT
+
       - name: Preview changelog
         run: |
           echo "## Preview of changelog for version ${{ inputs.version }}"