docs(sandbox-blaxel): add README with usage and configuration reference

.changeset/sandbox-blaxel-readme.md

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+---
+"@voltagent/sandbox-blaxel": patch
+---
+
+Add README documentation

packages/sandbox-blaxel/README.md

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+<div align="center">
+<a href="https://voltagent.dev/">
+<img width="1500" height="276" alt="voltagent" src="https://github.com/user-attachments/assets/d9ad69bd-b905-42a3-81af-99a0581348c0" />
+</a>
+
+<h3 align="center">
+AI Agent Engineering Platform
+</h3>
+
+<div align="center">
+    <a href="https://voltagent.dev">Home Page</a> |
+    <a href="https://voltagent.dev/docs/">Documentation</a> |
+    <a href="https://github.com/voltagent/voltagent/tree/main/examples">Examples</a>
+</div>
+</div>
+
+<br/>
+
+<div align="center">
+
+[![GitHub issues](https://img.shields.io/github/issues/voltagent/voltagent)](https://github.com/voltagent/voltagent/issues)
+[![GitHub pull requests](https://img.shields.io/github/issues-pr/voltagent/voltagent)](https://github.com/voltagent/voltagent/pulls)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![npm version](https://img.shields.io/npm/v/@voltagent/sandbox-blaxel.svg)](https://www.npmjs.com/package/@voltagent/sandbox-blaxel)
+[![npm downloads](https://img.shields.io/npm/dm/@voltagent/sandbox-blaxel.svg)](https://www.npmjs.com/package/@voltagent/sandbox-blaxel)
+[![Discord](https://img.shields.io/discord/1361559153780195478.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://s.voltagent.dev/discord)
+
+</div>
+
+## @voltagent/sandbox-blaxel
+
+A [Blaxel](https://www.blaxel.ai/) sandbox provider for VoltAgent's [Workspace](https://voltagent.dev/docs/) sandbox feature. `BlaxelSandbox` implements VoltAgent's `WorkspaceSandbox` contract, letting agents execute shell commands inside an isolated Blaxel sandbox instead of the local machine.
+
+---
+
+## Install
+
+```bash
+npm install @voltagent/sandbox-blaxel
+# or
+yarn add @voltagent/sandbox-blaxel
+# or
+pnpm add @voltagent/sandbox-blaxel
+```
+
+## Usage
+
+```typescript
+import { Agent, Workspace } from "@voltagent/core";
+import { BlaxelSandbox } from "@voltagent/sandbox-blaxel";
+import { openai } from "@ai-sdk/openai";
+
+const sandbox = new BlaxelSandbox({
+  apiKey: process.env.BL_API_KEY,
+  workspace: process.env.BL_WORKSPACE,
+});
+
+const agent = new Agent({
+  name: "my-agent",
+  instructions: "A helpful assistant with sandboxed shell access",
+  model: openai("gpt-4o-mini"),
+  workspace: new Workspace({ sandbox }),
+});
+```
+
+## Configuration
+
+`BlaxelSandboxOptions`:
+
+| Option      | Type                    | Description                                                                                      |
+| ----------- | ----------------------- | ------------------------------------------------------------------------------------------------ |
+| `apiKey`    | `string`                | Blaxel API key. Written to `process.env.BL_API_KEY` (the only auth path the Blaxel SDK supports) |
+| `workspace` | `string`                | Blaxel workspace ID. Written to `process.env.BL_WORKSPACE`                                       |
+| `config`    | `BlaxelSandboxConfig`   | Sandbox provisioning options plus VoltAgent `execute()` defaults (see below)                     |
+| `sandbox`   | `BlaxelSandboxInstance` | Pre-resolved Blaxel SDK sandbox instance to reuse instead of provisioning a new one              |
+
+`BlaxelSandboxConfig` (extends Blaxel's `SandboxCreateConfiguration`) adds:
+
+| Option             | Type     | Default                   | Description                                                                      |
+| ------------------ | -------- | ------------------------- | -------------------------------------------------------------------------------- |
+| `cwd`              | `string` | —                         | Default working directory for `execute()`; per-call `cwd` overrides it           |
+| `defaultTimeoutMs` | `number` | `60000`                   | Default command timeout; per-call `timeoutMs` overrides it; `0` disables it      |
+| `maxOutputBytes`   | `number` | `5 * 1024 * 1024` (5 MiB) | Max stdout/stderr bytes kept per stream before truncation; `0` skips log fetches |
+| `pollIntervalMs`   | `number` | `250`                     | Polling interval for waiting on command completion                               |
+
+> **Auth note:** credentials resolve through a module-level singleton in the Blaxel SDK — constructing multiple `BlaxelSandbox` instances with different credentials in the same process will last-write-win. See the [Blaxel sandbox authentication docs](https://docs.blaxel.ai/Sandboxes/Overview#learn-more-about-authentication-on-blaxel).
+
+## Documentation
+
+- [VoltAgent Documentation](https://voltagent.dev/docs/)
+- [Blaxel Documentation](https://docs.blaxel.ai/)
+
+## License
+
+Licensed under the MIT License, Copyright © 2026-present VoltAgent.