Revert "fix: use createRequire for sandbox-runtime lazy loading in ESM"

This reverts commit 9949c7a75a.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@shipany/open-agent-sdk",
-  "version": "0.1.6",
+  "version": "0.1.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@shipany/open-agent-sdk",
-      "version": "0.1.6",
+      "version": "0.1.5",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {

package.json

@@ -12,7 +12,7 @@
   "bugs": {
     "url": "https://github.com/shipany-ai/open-agent-sdk/issues"
   },
-  "version": "0.1.6",
+  "version": "0.1.5",
   "description": "Open-source Agent SDK inspired by @anthropic-ai/claude-agent-sdk. Runs the agent loop in-process — no local CLI required. Deploy anywhere: cloud, serverless, Docker, CI/CD.",
   "type": "module",
   "main": "./dist/sdk.js",

src/utils/sandbox/sandbox-adapter.ts

@@ -20,8 +20,6 @@ type SandboxViolationEvent = any
 // ---------------------------------------------------------------------------
 // Lazy-load @anthropic-ai/sandbox-runtime (optional dependency)
 // ---------------------------------------------------------------------------
-import { createRequire } from 'module'
-
 let _sandboxModule: any = null
 let _sandboxLoadAttempted = false
 
@@ -29,8 +27,9 @@ function getSandboxModule(): any {
   if (!_sandboxLoadAttempted) {
     _sandboxLoadAttempted = true
     try {
-      const _require = createRequire(import.meta.url)
-      _sandboxModule = _require('@anthropic-ai/sandbox-runtime')
+      // Use require so the module is resolved at call-time, not import-time.
+      // This keeps the SDK functional when the package is absent.
+      _sandboxModule = require('@anthropic-ai/sandbox-runtime')
     } catch {
       _sandboxModule = null
     }