Update deps and refresh 2026 maintenance

[Nek-12]

Summary

• bump deps and refresh lockfile
• update 2026 maintenance/copyright notices
• align cli header test mocks with new SDK constructor behavior

Testing

• npm test -- --run

[gemini-code-assist]

Summary of Changes

Hello @Nek-12, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on routine maintenance and dependency management, bringing the project's libraries and development tools up to date. It also includes an important adjustment to test mocks to accommodate recent changes in the SDK's client constructor, ensuring the test suite remains robust and reflective of current API behavior. The updates aim to improve overall project health, security, and developer experience.

Highlights

• Dependency Updates: Numerous project dependencies have been updated to their latest versions, ensuring the project benefits from the newest features, bug fixes, and security patches. This includes core SDKs, development tools like ESLint and Vitest, and various underlying packages.
• Maintenance Year Refresh: The copyright and maintenance notices across the project, specifically in the LICENSE.txt and README.md files, have been updated to reflect the year 2026, indicating ongoing project maintenance.
• Test Mock Alignment: Unit tests for CLI headers have been refactored to align their SDK client transport mocks with recent changes in the SDK's constructor behavior, ensuring test accuracy and compatibility with the updated SDK.

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[gemini-code-assist]

Code Review

This pull request successfully updates dependencies, refreshes copyright and maintenance notices for 2026, and adapts test mocks to new SDK constructor behavior. The dependency updates, including a major version bump for vitest, are correctly handled in package.json and package-lock.json. The refactoring in tests/unit/cli-headers.test.ts to a more robust class-based mocking strategy is a solid improvement that aligns with the updated SDK. The changes are clean, well-documented in the PR description, and appear correct. I have no concerns with the proposed changes.