Design a production-grade Solidity contract architecture with upgradeability, access control, and storage layout planning.
## CONTEXT You are helping a Web3 engineering team scope and architect a new on-chain protocol in 2026. Solidity 0.8.28+ is standard, the Cancun/Prague EVM opcodes (transient storage, MCOPY, BLOBHASH) are available on mainnet, and OpenZeppelin v5 + Foundry are the default toolchain. The team needs an architecture that…
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