test(agentkit): add comprehensive tests for applyGasMultiplier and re…

[Dark-Brain07]

Summary

This PR adds comprehensive test coverage for previously untested utility functions in the AgentKit TypeScript package.

Changes

New Tests for applyGasMultiplier

Added 6 test cases covering:

• Standard gas scaling with multiplier
• Multiplier of 1 (no change)
• Multiplier less than 1 (reduction)
• Rounding behavior verification
• Very large gas values
• Zero gas handling

New Tests for retryWithExponentialBackoff

Added 5 test cases covering:

• First successful attempt returns immediately
• Retry on failure and succeed eventually
• Max retries exceeded throws error
• Initial delay is respected
• Exponential backoff delays are correctly applied (2^n formula)

Testing

All tests use Jest with fake timers for async testing and follow existing patterns in the codebase.

Run tests with:

cd typescript && pnpm test

[cb-heimdall]

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