refactor: split examples into separate packages and update Claude plan mode

- Restructure examples into individual packages per provider (daytona, docker, e2b, vercel) with shared utilities in @sandbox-agent/example-shared
- Make Claude plan mode prompt-only (no longer requires permissionMode=plan)
- Claude now defaults to bypass permission mode
- Add agent_file_edit_flow test for file editing capabilities
- Fix Daytona file permission setting to use executeCommand

examples/docker/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@sandbox-agent/example-docker",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "start": "tsx docker.ts"
+  },
+  "dependencies": {
+    "dockerode": "latest",
+    "@sandbox-agent/example-shared": "workspace:*"
+  },
+  "devDependencies": {
+    "@types/dockerode": "latest",
+    "@types/node": "latest",
+    "tsx": "latest",
+    "typescript": "latest"
+  }
+}