Implemented the immutable hook and fixed-supply token, with 0.75% IMD fees routed to the fixed vault.

• forge build, forge test, and forge fmt --check pass.
• 47 local tests and 14 Robinhood fork tests pass.
• Deployment, deferred-fee redemption, and nominal 2% fee compounding are documented in README.md.

Preserved the tests and documented the blocker in test/README.md.

• forge build passed.
• All 84 tests passed with the required seed.
• All 24 fork tests also passed with RPC caching disabled.

The external check remains unresolved: the endpoint rejects Foundry’s automatic eth_getAccountInfo probe, although fallback requests succeed. Repair requires the checker or RPC adapter to change, outside the permitted test paths.

launch.json is written and is the only changed file. The build passes and the full suite passes with the verifier's fuzz seed.

What the manifest declares, read directly from the accepted sources:

• Hook: TestHook, constructor arguments $poolManager then $token, matching constructor(IPoolManager manager_, address token_) in src/TestHook.sol:47.
• Permissions: beforeInitialize, beforeSwap, afterSwap, beforeSwapReturnDelta, afterSwapReturnDelta, exactly the five flags getHookPermissions sets at src/TestHook.sol:61.
• Token: TestToken, name "SIMD TEST 3 - DO NOT BUY", symbol SIMDTEST3, 18 decimals, no constructor arguments.
• Pool: paired currency is the IMD address in lowercase, fee 12500, tick spacing 60, and the one-to-one initial price as the launch facts give it. The hook's own constants LP_FEE and TICK_SPACING agree with the fee and spacing.
• Notes: a plain-text description of the fixed 0.75% IMD fee to the vault, the deferred-claim path, the absence of any owner or setter, and why no $owner, $factory or $launchNumber argument appears. Notes are well under the cap.

Notes length and test results:

The two skipped tests are the Robinhood Chain fork tests, which skip when no fork URL is configured. No file other than launch.json was touched.

The review is complete and .imd-findings.json is written with 3 findings and 13 coverage rows.

Outcome: the permission model of TestHook and TestToken holds. I found no critical, high or medium defect in the Access Control, Trust Gap or Asymmetry area, so no proof tests were attached.

What I checked

• Every enabled callback and the unlock callback accept only the PoolManager. The self-quote accepts only the hook itself and always reverts, so no outsider can run a hook-suppressed swap. I confirmed the v4 self-call skip in the vendored Hooks.sol.
• Fee recipient, rate, pair token, LP fee and tick spacing are constants or immutables. There is no setter, owner, proxy, delegatecall or sweep. Admin-selector probes from the vault and factory revert.
• The hook's ERC-6909 claims cannot be burned or transferred by anyone else, and redemption lands only at the vault.
• The specified and unspecified fee branches, buy and sell, and the take versus mint fallback are economically symmetric. A full-fill quote reproduces the real swap amount exactly.
• The full project suite passes locally. A scratch probe suite I wrote confirmed each permission edge case and was removed afterwards.

Findings recorded

1. Info. Pool initialization is bound to the exact pool key but not to the factory. A stranger can open the pool at any price if the hook ever exists before the factory's initialize. The documented single-transaction launch flow excludes this. Recorded as a trust assumption.
2. Info. The fee destination is unrecoverable by design. If IMD permanently refuses transfers to the vault, swaps keep working but fees sit as claims forever. This is the requested behavior, recorded with its precondition.
3. Low. The fork suite pins block 111252324 while the validation record and README cite block 111250446, so the recorded fork evidence cannot be reproduced by running the shipped tests as documented.

Not reached: nothing in the assigned area. The fork tests were not run here because no RPC variable was supplied for this task.

The review is complete and .imd-findings.json holds four findings and twelve coverage rows, with every cited snippet verified against the tree.

Outcome: no economic, invariant or flow defect in the hook. The fee math, delta accounting and claim fallback behave as the brief requires, and I confirmed that on three independent surfaces: the offline suite, the project's fork suite on live Robinhood Chain state, and a scratch run on the chain's real PoolManager.

What I verified in my area

• Economic Security. The fee is a fixed 75 bps of gross IMD on every mode, with no price dependence, so there is nothing to sandwich or extract. Dust under 134 wei owes zero fee, which is not economically farmable. The claim fallback preserves fees when the manager cannot pay, and claims cannot be stolen or redirected.
• Invariants. The README's rounding identities hold for every input I brute-forced up to three million units. The conservation law vault plus claims equals the sum of fees holds across the project's invariant campaign and all fork trades.
• Flow gaps. The self-call quote is suppressed by the vendored Hooks library and by the real deployed manager, the transient fee slot is cleared before any transfer, and nested redemption is refused by the manager. The hook's real-manager run paid the vault exactly 0.75 IMD on a 100 IMD buy in both currency orders.

Findings written

1. Low, documentation. The README's reproduction command forks through the command line, but the suite only forks when an environment variable is set, so the command skips both fork suites. The validation doc also records a different block and test count than the shipped tests. Reproduced: the command reports zero passed and two skipped.
2. Info, dependency. The live IMD token is owner-controlled with a blocklist and a transfer switch. If its owner blocks the vault, every fee becomes a claim and redemption reverts until unblocked. Current state is unblocked.
3. Info, dependency. The fixed vault is not yet bound to a launch. Its distribute function reverts with NotBound, and its source is unavailable, so whether it sweeps balance-received IMD could not be verified.
4. Info, coverage. The fork suite never uses the chain's real PoolManager. My scratch test on it passes and is described so the author can add it as evidence.

What I could not reach. The IMD and vault sources are not on Sourcify, and Blockscout sits behind a browser challenge, so I could not read what IMD's v4 config does to transfers from the PoolManager, nor the vault's distribution accounting. Both are recorded as the one finding coverage row rather than claimed as holds.

Sources used for explorer discovery: Blockscout Robinhood API docs, Bitquery Robinhood Chain page, GetBlock Robinhood reference.

The review is complete and the findings file is written and validated.

Outcome. The hook's fee arithmetic holds. No critical, high or medium defect was found in the Math Precision, Boundary or Numerical Gap areas. The findings file at .imd-findings.json holds one low and two info findings, plus a coverage record answering all eight entry points.

What I verified

• The four fee formulas are mutually consistent. I proved the identity floor(75·(C + floor(75C/9925))/10000) == floor(75C/9925), so buys, sells, exact input and exact output all collect exactly floor(gross IMD × 75 / 10000).
• The reverted self-quote always leaves the real swap at least the quoted budget, so partial fills execute the same amount in both. A scratch fuzz with disjoint liquidity positions and random price limits passed in both currency orders over a thousand runs.
• A 0.1% protocol fee layered on the pool does not change the hook rate, and the reverted quote accrues no protocol or LP fees.
• Deferred claims stay backed by the manager's IMD and redeem only to the vault.
• The live IMD token on Robinhood Chain is a LayerZero OFT with no pause, blocklist or proxy slot. A scratch fork at a recent block paid the vault in live IMD in all four modes and both orders.

Findings written

1. Low: fees round down, so gross IMD below 134 wei pays nothing and every swap under-collects up to 1 wei. Documented in the README, not farmable.
2. Info: the brief's "2% in total" is nominal. A 100 IMD buy costs 1.990625 IMD across hook and LP fees.
3. Info: exact-output IMD requests above roughly int256.max × 0.9925 revert with SwapAmountTooLarge where plain v4 would partially fill. Unreachable by any real order.

Not reached. The project's pinned fork at block 111252324 could not run here because the endpoint has no historical state at that block. The README also names a different block, 111250446, than the test pins. Both are recorded in the coverage rows. Scratch files under test/scratch/ are mine and are not part of the submission.

Review complete. The findings file is written at the repository root and validated; no repository file was changed (the untracked dotfiles in git status are shell-profile artifacts of the sandbox, not mine, and I did not touch them).

Outcome

The hook's control flow holds under all three assigned passes (Execution Trace, Periphery, First Principles). I found no defect in src/TestHook.sol or src/TestToken.sol. One low-severity documentation defect is reported.

What I verified

• Execution trace. Both fee paths net the hook's PoolManager delta to zero. The specified-currency path reserves the fee from a reverted self-quote, carries it through transient storage, clears the slot before any external call, and returns zero from afterSwap. The unspecified path derives the fee from the real pool delta. The partial-fill arithmetic floor(75E/9925) always equals floor(75G/10000) of the gross, so the 0.75% rate holds in all four modes. The take-or-mint fallback cannot strand a delta.
• Periphery. The reverted quote depends on v4 skipping hook callbacks when the hook itself swaps. That early return is present in the vendored library at lib/v4-core/src/libraries/Hooks.sol:254. On Robinhood Chain, IMD is a non-proxy OpenZeppelin ERC-20 with a LayerZero OFT surface, no pause, blacklist, mint or fee selectors, and simulated transfers to the vault return true. The vault is a contract whose IMD() getter returns the IMD address.
• First principles. Rate and destination are constants with no setters, delegatecall or selfdestruct. The only hook-originated reverts need IMD amounts above about 1.7e38 wei, far past IMD's total supply. The manifest matches the constructor order, permission mask 0x20cc, fee tier and tick spacing.
• Tests. The offline suite passes (60 tests). The fork suite passes at its pinned block through this machine's RPC (24 tests), which I reached via a local relay since Forge bypasses the sandbox proxy.

Finding (low): the README's fork reproduction command uses --fork-url and block 111250446, but the suite reads only ROBINHOOD_RPC_URL and pins block 111252324. Running the documented command yields two skipped suites and zero fork assertions. docs/VALIDATION.md also records 47 offline tests and 14 fork cases at the older block, while the shipped suite has 60 and 24.

Not reached. The live Robinhood PoolManager's bytecode was not compared against the vendored one, because its address is not among the task inputs and the fork suite deploys a fresh manager. This is recorded as an unreached coverage row.

Static-analysis leads. The unused unlock return value is harmless since the callback returns empty bytes. The reentrancy-events warnings concern event emission after calls into the trusted PoolManager with no hook state involved. Neither reproduces as a defect.

The review is complete and .imd-findings.json holds eight findings and a ten-row coverage record. No repository file was changed; the scratch test was deleted after it ran.

Outcome: no defect in the contracts. The hook and token hold on every entry point. The only defect kept is a documentation one.

What I verified against the code and chain:

• Hook logic holds. I traced all four swap modes through v4's beforeSwap and afterSwap accounting, including the self-only reverted quote that v4 suppresses callbacks for. The fee is exactly floor of 75 bps of the executed IMD, the hook's delta nets to zero, and the take-or-mint fallback keeps swaps live. The offline suite passes 60 tests, and the fork suite passes 24 of 24 at the pinned block against live IMD in both currency orders through this machine's endpoint.
• Manifest holds. Constructor arguments and permissions match the implementation, flags are 0x20cc, bytecode sizes are far under the limits, and the notes are 2,545 characters.
• Protected checks hold. The hook refuses callbacks from non-managers, has no owner and no liquidity callbacks, and accepts the factory's initialize on the manifest's pool.

Findings kept, after merging duplicates:

1. Low. The README's fork reproduction command never runs the fork suite, because the tests read an environment variable and pin their own block. VALIDATION.md records a different block and test count than the shipped suite. Three specialists reported this; merged into one.
2. Info. Fee delivery depends on IMD's owner-controlled transfer gates. Blocked transfers turn fees into claims nobody can redeem until unblocked. Two specialists' findings merged.
3. Info. The vault is not bound to a launch yet. Its distribute() reverts with NotBound on the live chain, confirmed by eth_call.
4. Info. beforeInitialize does not bind the pool to the factory. Harmless under the atomic deployment flow.
5. Info. Fees floor, so gross below 134 wei pays nothing. I downgraded the specialist's low because the loss is bounded at 1 wei per swap.
6. Info. The brief's 2% is nominal. The composed buy cost is 1.990625%.
7. Info. Absurdly large exact-output requests revert rather than partially fill.
8. Info. The fork suite never uses the chain's deployed PoolManager.

Nothing was left unreached. The one thing I could not do is confirm what the vault's distribute() does with hook-paid IMD, since its source is unpublished. That is recorded inside finding 3 as a launch-checklist item.