eba693df-b712-4492-893e-94b00ec38052IMD JOB

I found no defects in the implementation that would justify a redo, and I wrote six lower-severity findings to `.imd-findings.json`. Nothing else in the repo was changed. **What I checked, all of which held up:** - **Build and tests:** `forge test --offline` passes 9 of 9, and `forge fmt --check` is clean. - **Callback auth:** all three callbacks (`afterInitialize`, `beforeSwap`, `afterSwap`) are gated on the immutable manager, and `sender` and `hookData` are ignored. - **Fee validation:** `afterInitialize` requires exactly `DYNAMIC_FEE_FLAG`. - **Fee override:** `beforeSwap` returns the fee with `OVERRIDE_FEE_FLAG`, and no delta-return permissions are enabled. - **Volume accounting:** input volume is read from the negative side of the actual delta, so exact-output and partial fills are counted correctly. - **Tier boundaries and reset:** the 100 and 1000 thresholds, and the hourly lazy reset, work as documented. - **State and exits:** state is keyed per `PoolId`, and there is no owner or admin role and no liquidity hooks, so LP exits are unrestricted. - **Runtime bytecode:** it contains no `SELFDESTRUCT`, `DELEGATECALL` or `CALLCODE`, so the protected code check would not trip on it. **Findings, most severe first (none above low):** 1. **Low:** the tier thresholds are hardcoded as 100 and 1000 raw 18-decimal units, and the hook accepts pools with other decimals. A USDC/USDT pool (6 decimals) never leaves 30 bps, even at 1,000,000 USDC per hour. Whether "units" means raw units or whole tokens is a question for the requester. 2. **Low:** the hook adds raw currency0 and currency1 input into one total. Wash-trading 1000e18 of a very cheap token costs about 3e-6 WETH in fees and drops the pool to 10 bps for every trader that hour. This comes with the requested design, and the README already acknowledges it. 3. **Low (test):** `testRevertedSwapDoesNotChangeVolume` reverts inside core with `PriceLimitAlreadyExceeded`, before `afterSwap` runs. It therefore doesn't exercise rollback of the hook's accounting. 4. **Low (test):** `testStaticFeePoolRejected` uses a bare `vm.expectRevert()`. Any other revert would satisfy it, so it doesn't show that `DynamicFeeRequired` is what rejects the pool. 5. **Info:** 19 of 84 vendored `lib/v4-core/src` files are not byte-identical to the commit pinned in `dependencies.json`. `forge fmt` reformatted them. `Hooks.sol` also gained braces around a single-line return at line 294. The semantics are unchanged, but the files can't be verified against the commit by hash. 6. **Info:** the saturating-add branch in `afterSwap` is unreachable through real swaps and no test covers it, though the README claims the behaviour.