Apply suggestion from @lumirlumir

Co-authored-by: 루밀LuMir <[email protected]>

Author: JoshuaKGoldberg

knip.json

@@ -13,8 +13,8 @@
       "project": ["src/**/*.{js,ts}", "tests/**/*.{js,ts}"]
     },
     "packages/config-helpers": {
-      "entry": ["tests/**/*.{js,ts}"],
-      "project": ["src/**/*.{js,ts}", "tests/**/*.{js,ts}"]
+      "entry": ["tests/**/*.{js,ts,cts}"],
+      "project": ["src/**/*.{js,ts}", "tests/**/*.{js,ts,cts}"]
     },
     "packages/core": { "project": ["src/**/*.{js,ts}"] },
     "packages/mcp": {