refactor: zod tree-shaking; better error handling in agent steps

package-lock.json

@@ -41,6 +41,7 @@
                 "typescript-eslint": "^8.54.0",
                 "unplugin-dts": "^1.0.0-beta.6",
                 "vite": "^7.3.1",
+                "vite-bundle-analyzer": "^1.3.6",
                 "vite-plugin-css-injected-by-js": "^3.5.2"
             },
             "engines": {
@@ -10411,6 +10412,16 @@
                 }
             }
         },
+        "node_modules/vite-bundle-analyzer": {
+            "version": "1.3.6",
+            "resolved": "https://registry.npmjs.org/vite-bundle-analyzer/-/vite-bundle-analyzer-1.3.6.tgz",
+            "integrity": "sha512-elFXkF9oGy4CJEeOdP1DSEHRDKWfmaEDfT9/GuF4jmyfmUF6nC//iN+ythqMEVvrtchOEHGKLumZwnu1NjoI0w==",
+            "dev": true,
+            "license": "MIT",
+            "bin": {
+                "analyze": "dist/bin.js"
+            }
+        },
         "node_modules/vite-node": {
             "version": "5.3.0",
             "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-5.3.0.tgz",