Added failure-path fuzz tests and independent balance/allowance invariants. Only two files under test/ were added.

forge build and forge test pass: 37 tests, 7,000 fuzz cases, and 40,960 invariant calls.

No defects found. Live Uniswap integration was not run.

Updated only launch.json, clarifying the accepted token’s behavior while preserving the exact pool and economics values.

Manifest fields and constructor ABI checks passed. forge build succeeded; forge test passed all 37 tests.

The review is complete. The findings file is written and the working tree has no modified tracked files.

Result: no defects found. The file .imd-findings.json holds an empty findings list and eight coverage rows, all holds.

What I checked, against the Execution Trace, Periphery and First Principles guides

• approve: only writes the caller's own allowance slot. Zero spender reverts. Replacement semantics, the unlimited sentinel, and the MAX-1 finite case were all executed.
• transfer: balance is debited before the credit is read, so a self-transfer preserves the balance. Zero value, zero recipient, value above balance, and value at the uint256 maximum all behave as intended.
• transferFrom: the allowance is checked and reduced before the balance move, so a revert in the move rolls back both. The three-way alias where holder, spender and recipient are the same address, the exact boundary where allowance equals balance equals value, and a zero-value call without allowance were traced and run.
• constructor: mints exactly 1e27 units to its caller once, with no arguments and no external calls. A CREATE2 factory fixture confirms the factory, not the transaction origin, holds the supply.
• Periphery: there are no libraries, helpers or base contracts. The compiled runtime contains no DELEGATECALL, CALLCODE or SELFDESTRUCT opcodes. Unknown selectors, short calldata and ether all revert.
• Launch flow: every leg moves exactly the requested amount and returns a single ABI-encoded true word, which the Uniswap v4 currency library accepts. The swarm's 10 percent plus the 90 percent pool share leaves the factory at exactly zero.
• Manifest: supply, decimals, empty constructor arguments, economics block and remainder address match the brief. The provenance sqrtPriceX96 recomputes exactly from the 2500 IMD cap over 1e27 units with SCAT as currency0.

Evidence run

• The delivered suite of 37 tests passes, including two stateful invariant suites and five 1000-run fuzz tests.
• A scratch suite of seven extra edge tests passed and was then deleted, since nothing under test/scratch is kept.
• Formatting check passes. Static analysis reported only a cosmetic large-literal note, which is the supply constant and not a defect.

Not covered: live Uniswap v4 seeding and swaps on mainnet, which the platform's protected harness runs with the real pool manager. That is the only launch behaviour this offline review could not exercise.

The math audit of SCATToken is complete and found no defects. The findings file at .imd-findings.json holds an empty findings list and seven coverage rows, all holds. No tracked file was changed.

What I checked, against the Math Precision, Boundary and Numerical Gap guides

• Arithmetic surface. The token has two subtractions and one addition, no division, no casts, no shifts, no external calls, no payable or bytes-decoding paths. Both subtractions are guarded by an explicit less-than revert. The receiver addition cannot wrap because balances always sum to the fixed supply.
• Supply constant. The literal flagged by aderyn evaluates at compile time to exactly 1e27, equal to the manifest's totalSupply, and the constructor credits all of it to msg.sender. The lead is not a defect.
• Allowance sentinel. Max is unlimited and max minus one is finite. I verified that one-unit boundary directly. A zero-value transferFrom with zero allowance takes no fast path and leaves the allowance untouched.
• Exact-balance edges. Value equal to balance passes, balance plus one reverts, self-transfers and self-transferFrom preserve balance while consuming finite allowance.
• Launch numbers. The manifest's sqrtPriceX96 equals sqrt(2500e18 / 1e27) times 2^96 with zero difference. Both possible currency orders lie inside Uniswap v4's price bounds. The 90% seed amount fits int128 and the implied single-sided liquidity fits uint128. The 10%/90% split of 1e27 leaves no dust.

Verification run

• Existing suite: 37 tests pass, including the 256-run ledger invariant.
• My scratch suite under test/scratch/MathBoundary.t.sol: 7 tests pass. That directory is gitignored and not part of the submission.

Not reached. Live Uniswap v4 seeding and swaps against mainnet state. The protected harness covers these in the platform environment, and no network was available here.

The review is complete. The findings file is written and no repository files were changed. The working tree shows no modifications beyond the untracked findings file, and my scratch probe directory has been removed.

Result: no defects in the Access Control, Trust Gap or Asymmetry areas. The token at src/SCATToken.sol has no roles, owner, initializer, proxy, hooks, fees or external calls. Its ABI exposes exactly the three state-changing functions the verifier listed, plus views. One informational note is recorded.

What I checked, in order:

• Permission map. The constructor hands out no roles and mints the whole supply to msg.sender. No selector in the ABI mutates anything other than the caller's own balance or allowance, and there is no receive or fallback. Admin-style selector sweeps from the deployer and from strangers all revert.
• Asymmetry diff. The transfer and transferFrom paths share one private helper, so validation, debit and credit are identical. The allowance decrement happens before the balance move and rolls back with it. Self-transfer is exact. The only asymmetry found is the standard ERC-20 approve replacement race, which the README documents and the brief's plain-ERC-20 scope implies.
• Trust-gap seams. With no privileged actor, no pricing formula and no caller-class branch, none of the four seams has two lenses to combine. I probed the PoolManager, the dead address and a factory-like address and all obey allowance like any holder.
• Launch floor. Full supply lands on the CREATE2 deployer, supply is a compile-time constant, no CALL-family opcode exists in the runtime, and the metadata confirms bytecode hash none, Cancun and the optimizer. The manifest copies the brief verbatim and its provenance sqrtPriceX96 equals the value derived from the economics with SCAT as currency0.
• Verification runs. Build, all 37 delivered tests including two invariant suites, and the formatter check pass. Five scratch probes I wrote for edge inputs also passed, then were deleted.

The findings file holds one info entry with a concrete trace and nine coverage rows: all three entry points are marked holds, plus rows for the constructor, supply invariant, opcode scan, fallback surface, manifest and the trust-gap seams. Nothing in my area was left unreached.

The review is complete and the findings file is written. The working tree is otherwise untouched.

Result: no defect in the Economic Security, Invariant or Flow Gap areas. The findings file holds one informational note and seven coverage rows, all three listed entry points answered.

What I checked and how it held up:

• Conservation and supply. The supply is a compile-time constant, the constructor credits it whole to the deployer, and the ABI exposes no mint, burn, owner, pause or upgrade selector. The existing suite's two stateful invariants and my own trace of the debit-then-credit order confirm the sum of balances never leaves 1e27, including on self-transfers.
• Bytecode. An independent opcode walk of both creation and runtime code found no DELEGATECALL, CALLCODE, SELFDESTRUCT, CALL, STATICCALL or CREATE. The artifact metadata confirms solc 0.8.26, Cancun, optimizer on and no bytecode hash.
• Launch flows. Every leg the factory, distributor and PoolManager drive uses plain transfer with a 32-byte true return, no fee, hook or callback, so v4 sync and settle deltas match what was sent. The remainder address is nonzero, so a zero or dust remainder transfer succeeds.
• Economics in launch.json. poolBps, initialMarketCapWei and remainderTo match the brief verbatim. Recomputing the sqrtPriceX96 from 2500 IMD over 1e27 units at high precision reproduces the manifest's initialPrice to the last digit.
• The one note (info). approve overwrites the allowance in place and there is no increaseAllowance, decreaseAllowance or permit, so a spender can front-run a replacement approval and move old plus new. I reproduced it with concrete balances in a scratch test, then deleted the scratch directory. It is the standard ERC-20 race, the README already discloses it, and the brief asks for plain ERC-20, so it is recorded for the judge rather than as a defect.

Not covered here: a live seed and swap against the real PoolManager, which is the protected harness's job and cannot run in this tree since neither forge-std nor v4-core is vendored.

The review is complete. .imd-findings.json is written with one merged info note and a coverage record of 8 rows. No repository file was changed, and the scratch test was removed.

Outcome: no defect reopens the work. The SCAT token is a 73-line dependency-free ERC-20 with constants for name, symbol, decimals and supply, no owner, no hooks, and no external calls. It builds reproducibly under the pinned toolchain, passes all 37 project tests including two stateful invariants, and forge fmt --check is clean.

Specialist findings judged

• The permissions and economics specialists each reported the same thing: approve replaces the allowance in place, so a spender can front-run a lowering approval and move old plus new. I reproduced it in a scratch test with the exact balances they stated. It is the standard EIP-20 race, the brief asks for plain ERC-20, and the README already documents it. Merged into one finding at info, explicitly marked as a trust note rather than a defect.
• The flow and math specialists reported nothing; I confirmed their holds rows myself rather than inheriting them.
• The aderyn large-literal lead evaluates to exactly 1e27 at compile time and was dropped.

Independent checks beyond the specialists

• A PUSH-aware scan of both runtime and creation bytecode found no DELEGATECALL, CALLCODE or SELFDESTRUCT.
• The compiled ABI exposes only the three listed entry points, so every mint, burn, pause, blacklist, seize and upgrade selector in the protected harness reverts.
• The manifest is schema-shaped, economics are copied verbatim, and the provenance sqrtPriceX96 implies 2.5e-6 IMD per SCAT, consistent with a 2500 IMD cap over 1e9 tokens.

Coverage record: all three entry points holds, plus rows for the constructor mint, post-launch supply immutability, forbidden-opcode scan, manifest, and the static-analysis lead.