Block eslint v10 majors temporarily (#901)

Plugin compatibility (typescript-eslint, eslint-plugin-mdx,
eslint-plugin-react) isn't there yet, so PR #898 keeps churning.
Revisit once the plugin majors that support eslint v10 land.

Co-authored-by: Dan Barr <6922515+danbarr@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: danbarr

renovate.json

@@ -64,6 +64,13 @@
       "matchUpdateTypes": ["major"],
       "enabled": false
     },
+    {
+      "description": "Temporarily block eslint v10. typescript-eslint, eslint-plugin-mdx, and eslint-plugin-react don't support v10 yet; revisit once plugin majors land.",
+      "matchManagers": ["npm"],
+      "matchPackageNames": ["eslint", "@eslint/js"],
+      "matchUpdateTypes": ["major"],
+      "enabled": false
+    },
     {
       "matchManagers": ["npm"],
       "matchDepTypes": ["engines"],