add Joint Iteration for Stage 4

Author: michaelficarra

2026/05.md

@@ -114,6 +114,7 @@ When applicable, use these emoji as a prefix to the agenda item topic.
 
     | stage | timebox | topic | presenter |
     |:-----:|:-------:|-------|-----------|
+    | 3 | 10m | [Joint Iteration](https://github.com/tc39/proposal-joint-iteration) for Stage 4 ([slides](https://docs.google.com/presentation/d/1KW2u1CeciwdoZjOnL5jb1pJxJUcgNjPeXsj5oVoaMxo)) | Michael Ficarra |
     | 2.7 | 20m | [ESM Phase Imports](https://github.com/tc39/proposal-esm-phase-imports) normative PRs (slides to follow, PRs [#58](https://github.com/tc39/proposal-esm-phase-imports/pull/58) & [#61](https://github.com/tc39/proposal-esm-phase-imports/pull/61)) | Guy Bedford |
     | 2.7 | 30m | [Iterator Chunking](https://github.com/tc39/proposal-iterator-chunking) for Stage 3 ([#30](https://github.com/tc39/proposal-iterator-chunking/pull/30), [tests](https://github.com/tc39/test262/pull/5011)) | Michael Ficarra |
     | 2 | 15m | [RegExp Buffer Boundaries](https://github.com/tc39/proposal-regexp-buffer-boundaries) for Stage 2.7 or 3 ([slides](https://1drv.ms/p/c/934f1675ed4c1638/IQBpJAD8CJutTpZ3x70Mr8C6AQ6Z26p2_nowaDED0_XQfRY?e=FLSMPe), [test262 PR](https://github.com/tc39/test262/pull/4975)) | Ron Buckton |