Update release notes for PR #5230

Author: ponylang-main

.release-notes/lsp-folding-range.md

@@ -33,3 +33,11 @@ The Pony language server now supports Go to Type Definition. Placing the cursor
 
 This works for explicitly annotated bindings (`let x: MyClass`) and for bindings whose type is inferred (`let x = MyClass.create()`).
 
+## Add LSP `textDocument/foldingRange` support
+
+The Pony language server now handles `textDocument/foldingRange` requests, enabling editors to show fold regions for Pony source files.
+
+A fold range is emitted for each top-level type entity (class, actor, struct, primitive, trait, interface) and for each multi-line member (fun, be, new). Within method bodies, fold ranges are also emitted for compound expressions: if (including ifdef, resolved to if by the compiler), while (including for, desugared to while by the compiler), repeat, match, try, and recover blocks. Single-line nodes are excluded since there is nothing to fold.
+
+The server also sends `workspace/foldingRange/refresh` after each compilation when the editor advertises support for it, so that fold regions update automatically when files change.
+