docs: convert HTML comment to markdown blockquote for GitHub visibility

[waynesun09]

Replace invisible HTML comment syntax with markdown blockquote in CHANGELOG.md to ensure important release note is visible on GitHub.

Changes

• Line 10: Converted HTML comment to markdown blockquote for MCP package release note
• Removed completed note about v4.4.0 API changes

Rationale

HTML comments (<!-- -->) don't render on GitHub's markdown viewer, while markdown blockquotes (> **Note:**) are properly displayed to maintainers and contributors reviewing the changelog.

This ensures critical release coordination notes are visible to all team members.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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