chore: merge release v2.0.0a1 to v2

[Jacksunwei]

Syncs version bump and CHANGELOG from release v2.0.0-alpha.1 to v2.

[gemini-code-assist]

Summary of Changes

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This pull request synchronizes the release configuration and changelog content for the v2 branch, specifically incorporating details from the 2.0.0-alpha.1 release. It ensures that the version manifest reflects the latest alpha release and that the release configuration includes the necessary SHA for tracking. Additionally, it introduces a dedicated changelog file to document the significant new features delivered in this alpha version.

Highlights

• Version Update: The project version in .release-please-manifest-v2.json has been updated from 2.0.0-alpha.0 to 2.0.0-alpha.1.
• Release Configuration: A last-release-sha entry has been added to .github/release-please-config-v2.json, pointing to a specific commit hash.
• Changelog Addition: A new CHANGELOG-v2.md file has been introduced, documenting the features for version 2.0.0-alpha.1, including a Workflow runtime and a Task API.

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