Add support for code appendices: enable code blocks with language labels, line-number gutter, and directive-based integration.

pdf_pages.go

@@ -171,8 +171,9 @@ func (r *IHKRenderer) RenderAppendices() {
 		case AppendixKindImage:
 			r.renderAppendixImage(app.Path)
 		case AppendixKindTable:
-			// Render without numbering/recording; the annex header already identifies the table.
 			r.renderTableBody(app.TableData, "")
+		case AppendixKindCode:
+			r.RenderCodeBlock(app.Lang, app.Code)
 		}
 
 		if app.Landscape {