Contract: Add Protocol Storage Clean-Up Refund Mechanism for Closed Plans

[ONEONUORA]

📌 Target Component

contracts/inheritance-contract/src/lib.rs

📝 Description

Cancelled or 100% claimed plans leave obsolete persistent storage keys on Stellar ledger without releasing storage fee deposit.

📋 Implementation Requirements

1. Call env.storage().persistent().remove(&key) when plan is fully closed and paid out.
2. Refund storage fee rent to plan creator wallet address.

🎯 Testnet Goal

Storage footprint minimization on Stellar testnet ledger.

[0x-fyve]

@0x-fyve has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hii, I’d like to pick this one up. I’ve gone through the issue and understand the goal of cleaning up closed plans and returning the associated storage rent to the creator. I can implement the cleanup in the contract and add the necessary tests to make sure the storage is removed and the refund goes to the correct wallet. Happy to take this on if it’s available.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @0x-fyve to this issue.