refactor: split contracts crate into separate packages

[snowrugar-beep]

Problem Statement

All contracts (GistRegistry, BatchWallet, MultiSig, Governance) live in a single Rust crate. This couples their versioning, compilation, testing, and deployment lifecycles. Independent contract upgrades are impossible without affecting other contracts.

Evidence

• contracts/Cargo.toml — Single crate with all code
• contracts/src/lib.rs — GistRegistry
• contracts/src/multi.rs — MultiSig + Governance code
• contracts/src/ops.rs, rollback.rs — BatchWallet tests

Impact

Monolithic crate couples unrelated contract lifecycles. Versioning is tied together. Testing one contract requires compiling all contracts.

Proposed Solution

1. Create directory structure: contracts/gist-registry/, contracts/multisig/, contracts/governance/, contracts/batch-wallet/
2. Each gets its own Cargo.toml, src/lib.rs
3. Move relevant code to each package
4. Create workspace Cargo.toml at contracts/ root
5. Update CI/CD deployment pipeline to target specific contracts

Technical Requirements

• Each contract must compile independently to WASM
• Each contract must have its own test suite
• Workspace must support shared dev-dependencies
• CI must build and test each contract independently

Acceptance Criteria

1. contracts/ is a Cargo workspace
2. Each contract builds independently: cargo build -p gist-registry --target wasm32-unknown-unknown --release
3. Each contract's tests pass independently
4. Workspace build builds all contracts
5. CI pipeline updated to build/test/deploy individual contracts
6. WASM binary sizes are not regressed

File Inventory

• contracts/Cargo.toml
• contracts/src/lib.rs
• contracts/src/multi.rs
• contracts/src/vault.rs
• contracts/src/ops.rs
• contracts/src/rollback.rs
• infrastructure/ci/contract-deployment.yml

Dependencies

Issue #1 (deduplicate contracts) must be completed first.

Testing Strategy

• Build and test each contract independently
• Verify workspace build produces same total output

Security Considerations

Independent contracts reduce blast radius of a vulnerability in one contract.

Definition of Done

• Contracts split into workspace packages
• Independent builds working
• All tests passing
• CI updated

[Agbasimere]

Hi there, I'd like to work on this issue

[MicD746]

Hello Maintainer, please can I work on this issue and give you a better result

[coderolisa]

Hello Maintainer,

I would like to work on this issue. I have reviewed the requirements and am confident I can implement the requested changes while meeting the acceptance criteria.

Please consider assigning this issue to me. Thank you.

[Menjay7]

Hi! I came across this issue and would love to work on it. I have experience with similar tasks and I'm confident I can investigate, implement a clean solution, and thoroughly test it before submitting a PR. If the issue is still open, I would appreciate it if you could assign it to me. Thank you!

[grantfox-oss]

🦊 GrantFox — @Menjay7 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 #44)
2. Your PR will be reviewed by the VertexChainLabs maintainers

Good luck! Track your progress on GrantFox.