kettle-rb / tree_haver / 20747090054

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🐛 **Java backend**: Fixed Optional handling in Node methods that could return nil incorrectly

- `child(index)`, `child_by_field_name(name)`, `parent`, `next_sibling`, `prev_sibling` now properly check for nil before attempting to unwrap Java Optional
- Previously, the ternary-based Optional check could fail when jtreesitter returned null directly instead of Optional.empty()
- This fixes JRuby test failures where `key_name` returned nil and object keys were not extracted

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