Implement Solidity MVS Manager with ERC4626 Compatibility and Modular Extensions

[Copilot]

This PR implements a complete Solidity version of the MVS (Multi-Vault Strategy) Manager as requested in the issue. The implementation provides an ERC4626-compatible vault that supports multiple modular extensions with configurable rebalancing operations.

Key Features

ERC4626 Compatible Vault

The MVSManager contract fully implements the ERC4626 standard, allowing it to integrate seamlessly with existing DeFi protocols and tooling. Users can deposit, mint, withdraw, and redeem shares using standard vault interfaces.

Modular Extension System

The manager supports up to 10 different strategy extensions through the IMVSSubExtension interface. Extensions can be:

• Added/removed by admins
• Automatically detected for yield capabilities via ERC165
• Emergency withdrawn from individually or collectively

Configurable Rebalancing

The rebalancing system allows admins to create named combinations of operations:

// Example: Create a rebalance combination that pushes 50% to leverage vault
MVSManager.RebalanceStep[] memory steps = new MVSManager.RebalanceStep[](1);
steps[0] = MVSManager.RebalanceStep({
    extensionIndex: 0,
    operation: 0, // push
    amount: 0, // 0 = use available balance
    data: abi.encode(20000) // 2x leverage parameter
});

uint256 combinationId = manager.addRebalanceCombination("Leverage Strategy", steps);

Total Assets Calculation

As specified in the requirements, total assets are calculated as:

managerBalance + sum(extensionAssets)

Where all assets are denominated in the manager's base asset token.

Advanced Yield Management

The implementation includes an IYieldExtension interface for extensions that generate yield:

• Automatic yield harvesting across all extensions
• Compound functionality for reinvesting rewards
• Performance tracking and APY monitoring

Implementation Structure

solidity/
├── src/
│   ├── MVSManager.sol              # Main ERC4626 vault contract
│   ├── interfaces/
│   │   ├── IMVSSubExtension.sol    # Base extension interface
│   │   └── IYieldExtension.sol     # Advanced yield interface
│   ├── extensions/
│   │   ├── LeverageVault.sol       # Example leveraged strategy
│   │   └── SimpleStakingVault.sol  # Example staking strategy
│   └── mocks/
│       └── MockERC20.sol           # Testing utilities
├── test/
│   ├── MVSManager.t.sol            # Solidity tests
│   └── MVSManager.test.ts          # TypeScript tests
└── README.md                       # Comprehensive documentation

Security Features

• Role-based Access Control: Separate admin and rebalancer roles
• Reentrancy Protection: All state-changing functions protected
• Pausable: Emergency stop functionality
• Extension Limits: Maximum 10 extensions to prevent gas issues
• Validation: Asset compatibility checks for all extensions

Example Extensions

LeverageVault

Demonstrates a leveraged strategy extension with configurable leverage multipliers (1x to 3x). Simulates interaction with lending protocols for borrowing and position management.

SimpleStakingVault

Shows a yield-generating extension that implements staking with APY calculations, reward harvesting, and compound functionality. Includes ERC165 support for automatic yield detection.

Usage Example

// Deploy manager
MVSManager manager = new MVSManager(
    IERC20(assetToken),
    "Multi-Vault Strategy Token",
    "mvsMGR",
    adminAddress
);

// Add extensions
manager.addExtension(leverageVault);
manager.addExtension(stakingVault);

// Create rebalance strategy
manager.addRebalanceCombination("Balanced Strategy", steps);

// Execute rebalancing
manager.rebalance(combinationId);

// Harvest yield from all extensions
manager.harvestAllExtensions(feeCollector);

The implementation maintains full compatibility with existing ERC4626 tooling while providing the requested modular architecture and configurable rebalancing capabilities.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• binaries.soliditylang.org
  • Triggering command: node /home/REDACTED/work/troves-contracts/troves-contracts/solidity/node_modules/.bin/hardhat compile (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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