feat(renovate): add dependency grouping for related packages

renovate.json

@@ -1,3 +1,38 @@
 {
-  "extends": ["github>freecodecamp/renovate-config"]
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["github>freecodecamp/renovate-config"],
+  "packageRules": [
+    {
+      "groupName": "vitest monorepo",
+      "matchPackagePatterns": ["^vitest", "^@vitest/"],
+      "description": "Group all Vitest packages together for coordinated testing framework updates"
+    },
+    {
+      "groupName": "GraphQL Code Generator",
+      "matchPackagePatterns": ["^@graphql-codegen/"],
+      "description": "Group all GraphQL Code Generator packages for coordinated codegen updates"
+    },
+    {
+      "groupName": "GraphQL ecosystem",
+      "matchPackageNames": ["graphql", "graphql-yoga"],
+      "matchPackagePatterns": ["^@graphql-tools/"],
+      "description": "Group core GraphQL runtime packages and tools"
+    },
+    {
+      "groupName": "code quality tools",
+      "matchPackageNames": ["oxlint", "prettier", "lint-staged"],
+      "description": "Group linting and formatting tools for coordinated updates"
+    },
+    {
+      "groupName": "build tools",
+      "matchPackageNames": ["turbo", "typescript", "tsx"],
+      "description": "Group build and compilation toolchain"
+    },
+    {
+      "groupName": "type definitions (non-major)",
+      "matchPackagePatterns": ["^@types/"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "description": "Group TypeScript type definition updates (non-breaking)"
+    }
+  ]
 }