fix action package exports and build ESM library entrypoints.

emit real ESM runtime + declaration outputs for programmatic imports, align package exports/types with built files, and add a no-cjs policy note.

Made-with: Cursor

tsconfig.exports.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "emitDeclarationOnly": true,
+    "declarationMap": false,
+    "outDir": "./dist"
+  },
+  "include": ["index.ts", "internal/index.ts"]
+}