chore(sandbox): release 0.1.0

Author: github-actions[bot]

packages/sandbox/CHANGELOG.md

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+# Changelog
+
+## [0.1.0](https://github.com/coder/ai-sdk/compare/sandbox-v0.1.0...sandbox-v0.1.0) (2026-06-18)
+
+Initial release of the sandbox package, migrated from @coder/ai-sdk-sandbox into the monorepo.
+
+### Highlights
+
+- The @coder/ai-sdk-sandbox package has been migrated into the monorepo and published as sandbox.
+
+### Code Refactoring
+
+* **sandbox:** migrate @coder/ai-sdk-sandbox into the monorepo ([5c4785d](https://github.com/coder/ai-sdk/commit/5c4785d2a6b0976fa87d4aeb6d0972c04ef95a61))