Add deprecation guides for ArrayProxy, ObjectProxy, and PromiseProxyMixin#1405

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wagenet wants to merge 4 commits intoember-learn:mainfrom

wagenet:proxies

Commits on Jun 20, 2025

Add deprecation guides for ArrayProxy, ObjectProxy, and PromiseProxyMixin
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Commits on Jun 23, 2025

Update to account for feedback
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Commits on Jul 15, 2025

Update wording to make it more clear that tracking is preferred
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Commits on Aug 12, 2025

Add note about ComputedProperties
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