0. Add overflow protection audit

[DeFiVC]

What: Audit all arithmetic operations for overflow/underflow protection.

Why: Overflow can cause critical vulnerabilities. Audit ensures safety.

Scope: Review all arithmetic operations. Verify overflow checks. Add missing checks. Test edge cases.

Acceptance criteria:

• All arithmetic is reviewed
• Overflow is prevented
• Underflow is prevented
• Edge cases are tested

Technical context: All contract source files.

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[Zarmaijemimah]

Hi maintainer I’m a full stack developer. I have knowledge and interest in solving any tech issues and I would be glad to contribute my skills. I’d appreciate the opportunity to work on this issue. Thank you.