Implemented Quantum Canary (CANARY): 1,000,000,000 tokens with 18 decimals, minted once to the deployer. No later minting or administrative controls.

Included vendored dependencies, success/failure tests, fuzz and invariant tests, and deployment documentation in README.md.

Validation passed:

• forge build
• forge test — 31 passed using the specified fuzz seed
• forge fmt --check

Created launch.json matching the accepted constructor, exact supply, pool settings, and economics.

forge build succeeded; all 31 local tests passed with the supplied fuzz seed. Only launch.json changed outside permitted scratch artifacts.

The review is complete. The findings file holds an empty list and a full coverage record. No source file was changed and the scratch test is removed.

Result: no defects in the math precision, boundary or numerical gap areas.

What I checked:

• The contract is a single-file OpenZeppelin v5.0.2 ERC-20 with one constructor mint and no overrides. Every vendored library file hashes to the value recorded in DEPENDENCIES.json, so the arithmetic under review is upstream's unmodified code.
• Math precision. The supply constant is a compile-time literal expression and evaluates exactly to ten to the twenty-seventh, matching the manifest string. There is no division, no cast, no scaling and no fee formula anywhere in the token, so there is nothing to round or truncate. The aderyn large-literal lead is a style note only.
• Boundary. The token makes no external calls, has no receive or fallback, decodes no bytes, and its only sentinel branches are the library's zero-address reverts. I probed 1 wei, full balance, self-transfer, max allowance minus one, max-uint amounts and ETH sends; each behaved as specified.
• Numerical gap. The launch split of the supply by basis points divides with no remainder and cannot overflow, so the factory's ten percent, pool share and remainder flows move exact amounts. The sum-of-balances invariant held across the project's stateful fuzz campaign with zero reverts.

Coverage rows mark all three entry points as holding, plus four invariant and boundary rows. The existing 31-test suite passes with the project's recorded seed.

The review is complete. The findings file is valid JSON, the snippet matches line 8 of the source exactly, and git status --porcelain is empty apart from the required output file.

Outcome: no defects found in the assigned area. One info-level note is recorded so the judge has it on file.

What was checked

• Execution trace. All three state-changing entry points traced through OpenZeppelin v5.0.2 to _update. Zero-address, insufficient balance and insufficient allowance paths revert with exact values. Unchecked arithmetic is safe because every subtraction is bounded by a prior check and supply is fixed. Rollback on failed transferFrom leaves allowance intact. No callbacks, fees, hooks or external calls exist.
• Periphery. Every vendored OpenZeppelin file matches the recorded sha256 and is byte-identical to the upstream v5.0.2 tag fetched independently. Context._msgSender returns msg.sender with no meta-transaction indirection.
• First principles. The only assumption is that the immediate deployer is the factory, which the launch harness guarantees via CREATE2. Supply is exactly 1e27 minted once. The ABI exposes no mint, burn, pause, blacklist, owner, initializer or fallback. Runtime contains no DELEGATECALL, CALLCODE or SELFDESTRUCT. Plain ETH, value-bearing calls and unknown selectors all revert.
• Launch floor. Name, symbol, decimals, contract identifier length and whole-amount transfers all satisfy the protected test expectations.
• Static leads. The aderyn large-literal note is a compile-time constant equal to 1e27. Slither reported nothing.

Verification runs

Check	Result
forge build	ok
Project suite with README seed	31 passed, 0 failed
Scratch edge tests (ETH, unknown selector, allowance race, max allowance, token-as-holder)	5 passed
forge fmt --check	ok

Recorded note (info). The standard ERC-20 allowance replacement race is present because the token adds no increase/decrease allowance helpers. The reproduction is a concrete two-approval sequence where the spender takes 150 instead of 100. It is inherent to the plain ERC-20 the brief asks for and the README already documents the mitigation, so it is reported at info and does not call for a code change.

Coverage. Ten rows written: all three listed entry points, the constructor mint, and six invariants. Nothing was left unreached. The scratch test directory was deleted after use.

The findings file is in place and is excluded from git by the repository's own exclude rule, which is expected for this review's output. The scratch directory is removed and no source file changed. Nothing further is needed.

Review complete: no defects found in the economics area.

Quantum Canary is a plain OpenZeppelin v5.0.2 ERC-20 with one constructor mint of 1e27 units to the immediate deployer. There is nothing in it for the Economic Security, Invariant or Flow Gap guides to break, and I confirmed that rather than assumed it.

What I verified:

• Supply conservation. The only writer of total supply is the constructor's single mint. The ABI exposes no mint, burn, burnFrom, owner or upgrade surface, and 22 common admin selectors revert from both the deployer and a stranger.
• Launch flows move exactly. The 10 percent swarm share, a full claim out of the distributor, an 80 percent pool seed and the remainder transfer all arrive whole. A buy and sell round trip through a pool-manager stand-in leaves exact balances, and an unlimited allowance is not decremented.
• Boundaries. Zero-value transfers from empty accounts succeed, self-transfers conserve, transfer to the zero address reverts, and over-balance or over-allowance by one wei reverts atomically.
• Deployer binding. The mint goes to the CREATE2 caller, not tx.origin, so the factory receives the supply.
• Periphery. The runtime has no DELEGATECALL, CALLCODE, SELFDESTRUCT, CREATE or external CALL. No receive or fallback exists.
• Dependency integrity. All five vendored OpenZeppelin files are byte-identical to the upstream v5.0.2 release archive and match DEPENDENCIES.json.
• Static-analysis lead. The aderyn large-literal note is the readable expression of exactly one billion tokens at 18 decimals and is not a defect.

The project's own 31 tests pass, and my 7 scratch probes passed before I removed them. The protected launch harness could not be run here because it imports v4-core and floor contracts absent from this tree, so I mirrored its token-level checks instead. The judge's independent harness remains the authority on the pool seed and swap legs.

Output written to .imd-findings.json with an empty findings list and nine coverage rows: the three entry points all hold, plus six invariant and dependency rows.

Added 16 adversarial unit/fuzz tests and expanded stateful invariants to cover failed calls, rollback, and allowance changes. All changes are within test/.

Verified offline with the required seed: forge build and forge test pass—47 reported tests, 10,000 fuzz cases, and 32,768 invariant calls.

No implementation defects found in the tested behavior.

Review complete. The report is in .imd-findings.json at the repository root, and the tree is otherwise unchanged (the scratch test was removed).

Outcome: no defects. Quantum Canary is an unmodified OpenZeppelin v5.0.2 ERC20 whose constructor mints the full supply once to msg.sender, with no admin, mint, burn, pause or fee paths.

Specialist findings: the two info-level reports from audit_permissions and audit_flow describe the same root cause, the standard ERC-20 allowance replacement race. I merged them into one info finding and reproduced it with a scratch Foundry test on this tree. The sequence approve 100, front-run transferFrom 100, approve 50, transferFrom 50 leaves the spender with 150e18. This is an inherent property of the plain ERC-20 the brief asks for, the README already documents the revoke-first workaround, and it does not block the launch. audit_math, audit_economics and the test writer reported nothing, and I found nothing they missed.

What I verified myself:

• All three entry points (approve, transfer, transferFrom) hold. Each traced through the OpenZeppelin code for guards, state writes and revert paths, and confirmed by the 47 existing tests plus my scratch tests.
• Supply, decimals, name and symbol match the manifest exactly. Creation code 2,645 bytes, runtime 1,752 bytes, both well under the limits. No DELEGATECALL, CALLCODE or SELFDESTRUCT in the runtime bytecode. No constructor arguments, so CREATE2 deployment needs nothing the manifest does not give.
• launch.json uses only schema keys, lowercase addresses, correct types, and a 13-character contract name.
• The protected tests could not be run here because they import Uniswap v4-core and floor sources absent from this tree. I checked each property they assert by hand against the code.

Coverage record answers all 3 listed entry points as holds, plus 4 invariant rows.