Add upgradeable ERC721 SeaDrop proxy tests #152
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Title: Add upgradeable ERC721 SeaDrop proxy tests
Motivation
The upgradeable package relied on Hardhat/OZ upgrades but shipped without any tests, so the proxy-safe ERC721 implementation had zero coverage. Without parity checks we cannot detect regressions in owner-only forwarding, mint gating, or storage layout across upgrades.
Solution
Added a lightweight SeaDrop mock plus a V2 token stub, then wrote a dedicated Hardhat test suite under
src-upgradeable/test/that deploys the proxy, verifies privileged configuration/minting mirrors the non-upgradeable contract, and asserts state survives upgrades. Wired the upgradeable Hardhat config/tsconfig to compile these specs and documented how to runyarn test:upgradeable. (Tests currently fail here because Node/yarn aren’t installed in this environment.)