[OpenAI Codex] [ Crypto ] Fix SimpleSwap slippage controls

[justusaugust]

/claim #913

Summary

• Require minAmountOut and deadline on swaps so users can bound slippage and stale execution.
• Round basis-point fees up for non-zero fees instead of silently truncating small trades to a zero fee.
• Add a Solidity runtime test that verifies exact-output swaps, slippage rejection, expired-deadline rejection, and small-amount fee precision.

Verification

• npm install --no-package-lock
• npm test

Demo Video

• Short demo video for this PR

[github-actions]

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

Make sure to review the acceptance criteria in the linked issue and verify all conditions are met before resubmitting. See CONTRIBUTING.md for guidelines.