test: implement Default for LimitedVec

[0rlych1kk4]

Summary

Implements Default for LimitedVec<T> in tests/util/inspector.rs by delegating to Self::new().

This resolves the clippy::new_without_default failure when running:

cargo clippy --test core_integration -- -D warnings

Testing

Verified locally with:

cargo clippy --test core_integration -- -D warnings

AI disclosure

ChatGPT was used to assist with drafting this pull request description. The submitted test-utility change was reviewed and verified locally.

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