Add read only key name

[Danitello123]

closes #110

Summary

Testing

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace

Checklist

• Linked issue or backlog item
• Contract behavior and invariants are described clearly
• Docs updated if contract interfaces or workflows changed
• Scope stays limited to one contract concern

[Chucks1093]

Closing to keep the queue focused; please reopen or resubmit if still needed.