Fix agent spend limits with BigInt stroops

[chiemezie1]

Fix agent spend limits with BigInt stroops

The BigInt-based spend-limit fix is now implemented, verified, committed, and pushed to the fork branch.

What changed

• Replaced float-based USDC/stroop handling with precise BigInt arithmetic in agent.js
• Added regression tests for exact-limit and one-stroop-over cases in agent.test.js

Verification

• Ran the agent test suite:
  • 1 test file passed
  • 31 tests passed
  • 0 failed

Closes: #362

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📥 Commits

Reviewing files that changed from the base of the PR and between a3fd824 and 28440cb.

📒 Files selected for processing (2)

• agent/agent.js
• agent/agent.test.js

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[ritik4ever]

Hi @chiemezie1,

This PR could not be merged because it has merge conflicts with the target branch.

Please resolve the merge conflicts, push the updated changes, and the PR can be reviewed and merged.

Thank you!