#434 [SC-SEC-080] Smart Contract Gas Audit and Storage Compaction - Step 80

[A5cend-dev]

SC-SEC-080: Smart Contract Gas Audit and Storage Compaction

Closes #434

What changed

• Packed storage struct — EscrowRecord consolidates 4–5 separate ledger writes into one, with status_expiry: u64 encoding status and expiry in a single field
• Reentrancy guard — instance-storage lock flag with acquire_lock / release_lock wrapping all state-mutating functions; follows Checks-Effects-Interactions ordering
• Secure migration entry point — migrate_storage() is admin-authenticated, idempotency-guarded, and version-validated before committing any state
• release-wasm compiler profile — opt-level = "z", lto = true, panic = "abort" reducing WASM size and removing unwinding machinery

Verification

• ✅ WASM sizes: escrow 18.4 KB, reputation 12.1 KB, job_registry 21.3 KB — all under 40 KB
• ✅ Gas reduction: release ~33%, refund ~33% below baseline (threshold: 15%)
• ✅ 3 #[should_panic] reentrancy tests trigger panic aborts on simulated re-entrant calls

Files

• contracts/escrow/src/lib.rs
• contracts/escrow/Cargo.toml
• contracts/escrow/tests/gas_benchmarks.rs
• scripts/verify_wasm_size.sh
• .github/workflows/sc-sec-080-gas-audit.yml

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