chore(deps-dev): bump the dev-dependencies group across 1 directory with 3 updates

Bumps the dev-dependencies group with 3 updates in the / directory: [@opencode-ai/sdk](https://github.com/sst/opencode-sdk-js), [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) and [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest).


Updates `@opencode-ai/sdk` from 1.18.21 to 1.18.29
- [Release notes](https://github.com/sst/opencode-sdk-js/releases)
- [Changelog](https://github.com/anomalyco/opencode-sdk-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sst/opencode-sdk-js/commits)

Updates `@types/node` from 26.2.0 to 26.4.1
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

Updates `vitest` from 4.1.11 to 5.0.0
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Changelog](https://github.com/vitest-dev/vitest/blob/main/docs/releases.md)
- [Commits](https://github.com/vitest-dev/vitest/commits/v5.0.0/packages/vitest)

---
updated-dependencies:
- dependency-name: "@opencode-ai/sdk"
  dependency-version: 1.18.29
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: "@types/node"
  dependency-version: 26.4.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
- dependency-name: vitest
  dependency-version: 5.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dev-dependencies
...

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Author: dependabot[bot]