Changelog for v0.51.0

[gemini-cli-robot]

This PR contains the auto-generated changelog for the v0.51.0 release.

Please review and merge.

Related to #18505

[github-actions]

📊 PR Size: size/M

• Lines changed: 88
• Additions: +70
• Deletions: -18
• Files changed: 2

[gemini-code-assist]

Summary of Changes

Hello, 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 introduces the auto-generated changelog for the v0.51.0 release. It captures the latest features, security enhancements, and stability improvements implemented across the project, providing a comprehensive summary of the changes for users and contributors.

Highlights

• Caretaker Services: Implemented foundational infrastructure for Caretaker on Cloud Run, including webhook ingestion and egress service skeletons.
• Security and Sandbox Hardening: Strengthened agent security by enforcing case-insensitive path validation, fixing symbolic link directory escapes, and restricting Git configuration access in the macOS sandbox.
• Core Stability and Reasoning: Improved model compatibility by preserving escape sequences in string literals and added safeguards to prevent thought leakage in scrubbed history turns.

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[github-actions]

Size Change: -4 B (0%)

Total Size: 35.2 MB

Filename	Size	Change
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./bundle/oauth2-provider-YICM3RTL.js	9.12 kB	+9.12 kB (new file)	🆕

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[gemini-code-assist]

Code Review

This pull request updates the project documentation to reflect the release of v0.51.0, including the addition of new release announcements and an updated changelog highlighting improvements in Caretaker services, security hardening, and core stability. I have no feedback to provide as there were no review comments.

_{Note: Security Review has been skipped due to the limited scope of the PR.}