Update package.json with main and module entry points

Changed the "main" attribute from "index.js" to "lib.js" and added "module" and "exports" fields for compatibility with both import and require statements. Also incremented the version from 1.0.3 to 1.0.4.

package.json

@@ -1,9 +1,16 @@
 {
   "name": "workflow-function-manifold",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "type": "module",
   "description": "for building dynamic, LLM-driven workflows using a region-based execution model",
-  "main": "index.js",
+  "main": "lib.js",
+  "module": "lib.js",
+  "exports": {
+    ".": {
+      "import": "./lib.js",
+      "require": "./lib.js"
+    }
+  },
   "bin": {
     "workflow-function-manifold": "./bin.js"
   },