v4-hook-reentrancy-via-unlock

Detect reentrancy in Uniswap V4 hooks via the PoolManager unlock/lock callback. V4 uses a singleton PoolManager with transient lock state; all pool mutations happen inside an unlockCallback. A hook that makes external calls during beforeSwap/afterSwap/before*Liquidity (to tokens with hooks, arbitrary routers, or user-controlled contracts) can be re-entered, and because the manager is already unlocked the attacker can recursively swap/modify liquidity against stale hook state. Activate on any V4 hook performing external calls inside a callback, or custom unlockCallback logic.