3. Add storage optimization audit

[DeFiVC]

What: Audit contract storage patterns and identify optimization opportunities.

Why: Storage costs money on-chain. Optimization reduces costs.

Scope: Audit storage key design. Identify redundant storage. Optimize data structures. Measure storage reduction.

Acceptance criteria:

• Storage patterns are audited
• Redundancy is identified
• Optimizations are applied
• Storage reduction is documented

Technical context: contracts/*/src/storage.rs — storage patterns.

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