Add test files to markdown ignore file

am1r021 · am1r021 · commit 708eef607a35 · 2026-03-25T14:47:29.000-07:00
diff --git a/.markdownlintignore b/.markdownlintignore
@@ -4,3 +4,6 @@ CHANGELOG-API.md
 
 # GitHub templates (intentional structure/HTML)
 .github/
+
+# Test fixtures (managed by mdatagen tests)
+cmd/mdatagen/internal/testdata/
