Implemented the hook, pinned vendored dependencies, real PoolManager integration tests, and README.

The hook authenticates callbacks, requires dynamic-fee pools, applies immutable parity fees, and leaves LP exits unrestricted.

Validation passed:

• forge build --offline
• forge test --offline — 12 tests passed
• forge fmt --check

README documents parameters, assumptions, responsibilities, and the 100% fee limitation.

I reviewed the hook and its tests and found no high or medium defects. The findings are in .imd-findings.json. I ran forge test --offline and all 12 tests passed.

The code checks out against the requested design:

• Caller checks: afterInitialize, beforeSwap and the fallback all reject any caller other than the PoolManager.
• Permissions: the address flags (0x1080) match getHookPermissions, with only afterInitialize and beforeSwap enabled.
• Dynamic fee: afterInitialize requires the fee to equal DYNAMIC_FEE_FLAG exactly.
• Swap fee: beforeSwap returns a zero delta and an override fee taken from block.number alone.
• Isolation and exits: the hook keeps no state, so pools stay isolated, and it never gates liquidity removal.
• Admin powers: there is no owner or admin role.
• Tests: they run against a real PoolManager and check the emitted Swap fee on both parities.

Findings, ranked by severity:

1. Low: on chains like Arbitrum, block.number is an approximate L1 block number, so many L2 blocks share one parity. The README doesn't say this.
2. Low: test_WrongAddressFlagsRejected uses a bare expectRevert(). It passes on any revert, so it doesn't prove the address-flag check fires.
3. Info: oddFee = 1_000_000 is allowed. An exact-input odd-block swap then returns zero output, and exact-output reverts. This is documented and tested, so it is not a defect.
4. Info: a summary entry recording that no high or medium defects were found.

I changed no files other than writing the findings file.