Fix moduleNameMapping typo in Jest config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mikfreedman

package.json

@@ -33,7 +33,7 @@
     "extensionsToTreatAsEsm": [
       ".ts"
     ],
-    "moduleNameMapping": {
+    "moduleNameMapper": {
       "^(\\.{1,2}/.*)\\.js$": "$1"
     },
     "transform": {