1. Add contract size optimization audit

[DeFiVC]

What: Audit contract WASM sizes and identify optimization opportunities.

Why: Contract size affects deployment costs. Optimization reduces costs.

Scope: Measure current WASM sizes. Identify large functions. Optimize storage patterns. Remove unused code. Measure after optimization.

Acceptance criteria:

• Sizes are measured
• Opportunities are identified
• Optimizations are applied
• Size reduction is documented

Technical context: Cargo.toml:20-28 — release profile.

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