chore: prepare changelog for v0.12.21

[itsomri]

Description

Prepare changelog for v0.12.21 release.

🤖 Generated with Claude Code

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch omric/prep-changelog-v0.12.21

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