Calculate closures correctly (#309)

* Maybe really fixes closures

* fornat

* add ai generated tests

* fix tests

* fix tests

* added test with correct number of closures?

* closures are self contained.  don't increment on attached properties

* format

* MergeClosure should reuse if exists, not just set

* add not null on a method

.github/git-commit-instructions.md

@@ -0,0 +1,22 @@
+# Git Commit Instructions
+
+To ensure high-quality and consistent commits, please follow these guidelines:
+
+1. **Format your code**
+    - Run the `csharpier` formatter on all C# files before committing.
+    - Ensure your code adheres to the `.editorconfig` settings.
+
+2. **Write clear commit messages**
+    - Use the present tense ("Add feature" not "Added feature").
+    - Start with a short summary (max 72 characters), followed by a blank line and a detailed description if necessary.
+
+3. **Test your changes**
+    - Run all unit tests before committing.
+    - Add or update xUnit tests as needed.
+    - Use FluentAssertions for assertions and Moq for mocking in tests.
+
+4. **Review your changes**
+    - Double-check for accidental debug code or commented-out code.
+    - Ensure only relevant files are staged.
+
+Thank you for helping maintain code quality!