docs: update changelog for 0.3.70

[gmegidish]

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• CHANGELOG.md

Cache: Disabled due to data retention organization setting

Knowledge base: Disabled due to data retention organization setting

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Walkthrough

A new changelog entry for version 0.3.70 was added, documenting iOS-specific updates. The changes include modifications to simulator runner termination behavior and addition of a shutdown hook registration on agent start. The devicekit-ios agent dependency was bumped to version 0.0.18. Additionally, a placeholder field was added to the dump UI view tree response. This is a documentation-only change with no alterations to exported or public entities.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/changelog-0.3.70

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