Upgradeable Staking Facet (Diamond, Add-Only)

Minimal EIP-2535-style Diamond that supports only adding facets (no replace/remove yet), plus a native-token staking facet that uses a dedicated storage slot.

Contracts

• Diamond proxy: src/Diamond.sol
• DiamondCut interface: src/interfaces/IDiamondCut.sol
• Add-only diamond logic: src/libraries/LibDiamond.sol
• DiamondCut facet: src/facets/DiamondCutFacet.sol
• Staking storage: src/libraries/LibStaking.sol
• Staking facet: src/facets/StakingFacet.sol

Test

• test/StakingFacetDiamond.t.sol deploys the diamond, adds StakingFacet via diamondCut(Add), then stakes/withdraws through the diamond address.

Quickstart

forge build
forge test