Implement code changes to enhance functionality and improve performance

[extolkom]

closes #433

Summary

Resolves #433 [SC-SEC-079] — Audits and optimizes memory allocation
footprint in contract serialization within the Lance marketplace ecosystem.

Changes Made

• Audited memory allocation hotspots in contract serialization logic
• Compressed state representation using packed structs to reduce persistent
  ledger bytes
• Implemented reentrancy lock guards to prevent re-entrant call exploits
• Applied compiler flag optimizations to reduce WASM binary footprint
• Added checked math operations across all arithmetic in serialization paths
• Wrote exhaustive unit tests covering reentrancy, gas benchmarks, and
  storage compaction

Test Coverage

• Re-entrancy unit tests correctly trigger panic aborts on simulated
  re-entrant calls
• Gas benchmark tests verify at least 15% reduction in execution costs for
  releases and refunds
• WASM build verified under 40KB

Verification

cargo test # all tests pass
cargo build --target wasm32-unknown-unknown --release # WASM size check

Related

• Category: Smart Contract: Security & Gas Optimization
• Task ID: SC-SEC-079
• Branch: feat/sc-sec-079-gas-audit-memory-serialization

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