[Task]: Emit events when assets are added or removed from the whitelist

[grantfox-oss]

add_asset() and remove_asset() update the asset whitelist in persistent storage with no on-chain event. Indexers and clients cannot detect whitelist changes without polling is_supported_asset() for every token they care about.

Add two event structs:

#[contractevent]
pub struct AddAssetEvent {
    #[topic]
    pub asset: Address,
    pub admin: Address,
}

#[contractevent]
pub struct RemoveAssetEvent {
    #[topic]
    pub asset: Address,
    pub admin: Address,
}

Emit AddAssetEvent at the end of add_asset() and RemoveAssetEvent at the end of remove_asset(). Only these two functions are modified.

Acceptance criteria

• AddAssetEvent and RemoveAssetEvent are defined with #[contractevent]
• add_asset() emits AddAssetEvent after writing to storage
• remove_asset() emits RemoveAssetEvent after removing from storage (only if the key existed)
• Tests verify both events are emitted using env.events().all()
• cargo test and cargo clippy -- -D warnings pass

Relevant files

• contracts/agent-vault/src/lib.rs (only add_asset and remove_asset functions)
• contracts/agent-vault/src/tests.rs

Notes for contributors

If you'd like to work on this, comment below so we can assign it to you.
Questions welcome — see CONTRIBUTING.md for setup
and workflow.

[IyanuOluwaJesuloba]

Hello Maintainer.

I am a full stack web3 developer with professional experience in software development, integration and smart contract writing.

I understand the criticality of this task and I am confident that I will deliver accordingly.

I'd love to contribute my expertise to your project. Kindly assign this issue to me.

[gloskull]

Hi, I’d love to work on this issue. I have 4 years of experience across backend, frontend, full-stack, and smart contract development. I understand the task clearly and can deliver a clean, efficient, well-tested solution on time, with strong focus on code quality and maintainability. My PR will be submitted in under 10 hours.

[Itodo-S]

Please let me work on this; I can handle it

[TheBigWealth89]

I would love to work on this issue.

[Ekenesamuel8]

hello boss, i will love to work on this issue

[grantfox-oss]

🦊 GrantFox — @Itodo-S has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #37)
2. Your PR will be reviewed by the clevercon-protocol maintainers

Good luck! Track your progress on GrantFox.