Add integration test confirming sell reverts when holder attempts to sell more keys than they own

[Chucks1093]

Summary

The sell function should revert if a holder tries to sell a quantity greater than their current balance. An integration test should cover this path, verify the error code, and confirm no keys were deducted from the holder's balance.

Scope

• Set up a holder with exactly 2 keys via buy transactions
• Invoke sell with quantity 3
• Assert the transaction reverts with the correct insufficient-balance error code
• Assert the holder still owns exactly 2 keys after the failed sell

Acceptance Criteria

• Transaction reverts when sell quantity exceeds holder balance
• Error code matches the insufficient-balance variant
• Holder balance unchanged at 2 after the failed sell
• Creator supply unchanged after the failed sell

ETA: 12 hours

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Coordinate on Telegram

[vj570145-web]

Hi maintainer, I am a fullstack dev and I would love to work work on this task. I have read through the description and the acceptance criteria. I am confident I can fix this issue

[OluRemiFour]

I can take this on. I've gone through the details and will provide a well-tested solution aligned with the project standards.

[felladaniel36-hash]

I'd like to claim this issue. I have reviewed the details and can begin working on a fix right away. Please assign it to me if it's still available. Thanks!

[chidii]

Hi Maintainer, reviewed the issue in detail. Full stack background with solid experience relevant to this task. No blockers on my end — I'm ready to submit a PR shortly. Please assign.

[chidii]

Hi Maintainer, reviewed the issue in detail. Full stack background with solid experience relevant to this task. No blockers on my end — I'm ready to submit a PR shortly. Please assign.

[spartan124]

Hi maintainer, I would love to work on this. I have implemeted similar solutions on several projects and I can do same here cleanly and efficiently. Allow me the opportunity to contribute to your project while following contribution guidelines for your project. Kindly assign.

[damzempire]

i would like to work on this issue as a full stack and smart contract developer

[grantfox-oss]

🦊 GrantFox — @chidii has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #554)
2. Your PR will be reviewed by the accesslayerorg maintainers

Good luck! Track your progress on GrantFox.