chore(tsconfig): override rootDir in tsconfig.test.json

Set rootDir to "." in `tsconfig.test.json` to override the inherited
value from `tsconfig.build.json`. This allows TypeScript to type-check
files outside the src directory (tests, benchmarks, configs).

Author: remarkablemark

tsconfig.test.json

@@ -6,7 +6,8 @@
     "moduleResolution": "nodenext",
     "types": ["vitest/globals"],
     "noEmit": true,
-    "allowJs": true
+    "allowJs": true,
+    "rootDir": "."
   },
   "include": [
     "__tests__",