Fix closure capturing memoryObserver before declaration

[backup-bdg]

This PR fixes the compiler error in CoreMLManager.swift where the closure was capturing the memoryObserver variable before it was declared.

The error was:

closure captures memoryObserver before it is declared

Changes made:

1. Declared memoryObserver as an optional variable before assigning it
2. Used optional binding when referencing it inside the closure
3. Used optional binding when adding it to the memoryObservers array

This ensures the variable is properly declared before being referenced in the closure.

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