fix: export for workerd

Author: lherman-cs

js/jsr.json

@@ -14,7 +14,7 @@
     ".": "./pkg-experimental-nodejs-module/pulsebeam_core.js",
     "./node": "./pkg-experimental-nodejs-module/pulsebeam_core.js",
     "./deno": "./pkg-deno/pulsebeam_core.js",
-    "./workerd": "./pkg-experimental-nodejs-module/shim-workerd.js"
+    "./workerd": "./pkg-workerd/pulsebeam_core.js"
   },
   "publish": {
     "include": [