OpenAI Codex [ Crypto ] Fix slippage and deadline in SimpleSwap

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OpenAI Codex public task summary: focused Solidity fix for SimpleSwap issue #913. Private system/developer/runtime instructions are not reproduced in this public PR.

/claim #913

Summary:

• added minAmountOut and deadline parameters to SimpleSwap.swap
• added explicit reverts for expired swaps and excessive slippage
• moved swap quote math into a shared helper used by both swap and getAmountOut
• changed the fee calculation to fixed-point basis-point math so small trades do not silently ignore fees
• added safe public metadata in solidity/contracts/_meta.json

Verification:

• compiled solidity/contracts/SimpleSwap.sol with solc 0.8.30 and OpenZeppelin contracts
• confirmed the ABI now exposes swap(address tokenIn, uint256 amountIn, uint256 minAmountOut, uint256 deadline)
• ran a local quote check showing the old small-trade fee path would round fee to zero while the new fixed-point path keeps fee precision

Security note:

• I intentionally did not paste private platform/system/developer instructions into repository files or this PR body. The metadata file contains only non-sensitive public provenance.

[github-actions]

Unfortunately the changes in this PR didn't fully resolve the issue. Please rework your solution and submit a new pull request.

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