Implemented the complete Foundry contract deliverable:

• Fixed-supply Pledge.sol
• Custodial weekly-check-in HabitPledge.sol
• Nine success, failure, boundary, conservation, transfer-failure, and reentrancy tests
• Canonical ABI exports under docs/abi/
• Deployment assumptions and operational responsibilities in contracts.html
• Vendored minimal forge-std compatibility for offline protected checks
• Foundry configured with Solidity 0.8.26 and bytecode_hash = "none"

Validation passed:

• forge build
• forge test: 9 passed, 0 failed
• forge fmt --check
• Protected test sources compile offline
• ABI JSON validation and git diff --check

No launch.json was created because it belongs to the separate manifest assignment.

I found no contract defect that puts funds at risk. The problems are in the tests, plus one low-severity input-validation gap. The findings are in .imd-findings.json, five in all, ranked by severity.

Findings

1. Medium, no event assertions. The brief requires events for every state change, but no test checks any event. Deleting every emit line from HabitPledge.sol still leaves 9 of 9 tests passing.
2. Medium, reentrancy tested on createPledge only. The malicious token re-enters from transferFrom, and its transfer() never calls back. Removing nonReentrant from withdraw or checkIn still passes.
3. Medium, validation branches untested. Every mutation I tried survived the suite:
   • allowing a zero stake;
   • raising the week cap to 255;
   • allowing a zero-address beneficiary;
   • dropping the token-code check;
   • dropping the unknown-pledge check;
   • PLDG allowances that never decrease;
   • PLDG transfers to address(0) that burn tokens.
4. Low, beneficiary can lock funds. createPledge accepts the HabitPledge contract or the token contract as beneficiary. On withdraw the forfeited slice goes there and can never be moved. I reproduced this in a scratch test. Only the pledger's own stake is affected.
5. Info, interface constraints. The 52-week cap and settlement only at or after the end time are stricter than the brief. Both are documented, but the website must enforce them.

What I checked and found correct

• Window arithmetic is consistent at the boundaries, and the 52-bit check-in bitmap fits.
• Conservation of funds holds with exact slices, and settled is set before the transfers.
• The reentrancy guard and the false-return and revert handling on token transfers are correct.
• The token mints the fixed 10^27 supply with 18 decimals and no admin path.
• docs/abi/*.json matches the compiled ABI once internalType fields are ignored.
• Neither the creation code nor the runtime code contains DELEGATECALL, CALLCODE or SELFDESTRUCT.
• The constructor takes only the token address, which matches the $token manifest requirement. There is no launch.json yet, so I did not review one.

Scope

• All builds and mutation runs used /tmp output and scratch copies, so the repo has no other changes.
• I did not edit any source, test, config or docs file.
• The only file I wrote is .imd-findings.json, the deliverable you asked for.
• Foundry downloaded solc 0.8.26 on first run.

Created launch.json with:

• Pledge token metadata
• HabitPledge with the $token constructor argument
• Canonical native-ETH Sepolia pool settings
• No unsupported supply, allocation, owner, or initialization fields

Verification passed:

• forge build
• forge test — 9 passed, 0 failed
• Only launch.json is changed/untracked.

I found no blocking defects in the contracts or the manifest. The two findings are a test-coverage gap and a non-blocking note, and they're written to .imd-findings.json.

I ran forge test: all 9 tests pass. I checked these areas:

• Checks-effects-interactions: state is set before the token calls in both createPledge and withdraw.
• Settlement accounting: returned + forfeited always equals stake, and stake % weeksCount == 0 means slices carry no rounding remainder.
• Timing: checkIn reverts at endTime, and withdraw is allowed from endTime.
• Bitmap: MAX_WEEKS of 52 fits in the 256-bit check-in bitmap.
• Roles and calls: there is no owner or admin role, and no external calls other than the token.
• Token: Pledge mints 10^27 to the deployer in its zero-argument constructor and has no mint function. foundry.toml sets bytecode_hash = "none".
• Manifest: launch.json uses only schema fields. Its one constructor argument is $token, and there is no $owner.

Findings, ranked:

1. Low — reentrancy is tested only through createPledge. Removing nonReentrant from withdraw in src/HabitPledge.sol leaves all 9 tests passing. No test uses a token whose transfer calls back into withdraw, and none covers checkIn. The brief asks for reentrancy tests through a malicious token.
2. Info — limits the brief doesn't state. MAX_WEEKS = 52 and the requirement that stake be divisible by weeksCount aren't in the brief. For example, createPledge(goal, 53, b, 53e18) reverts with InvalidWeeks. The beneficiary != msg.sender check is bypassed with a second address. Neither is exploitable.