[CORE] Build CLI Storage Slot Visualizer & Re-Packing Auto-Fixer

[mijinummi]

Labels: high-difficulty, rust, cli, storage, gasguard
Difficulty: High
Module: gasguard-cli/src/commands/optimize_storage.rs

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🧠 Concept

Add a GasGuard CLI tool (gasguard optimize-storage <Contract.sol>) that parses contract state variables, models EVM storage packing, and outputs an optimal variable layout.

⚠️ Problem

Manually calculating variable bit sizes to pack storage slots across complex inheritance trees is difficult and prone to missing packing opportunities.

📁 Implementation Scope

• gasguard-cli/src/commands/optimize_storage.rs
• gasguard-cli/src/storage_model.rs

🛠️ Requirements

1. Parse contract definitions and extract state variable types and order.
2. Simulate EVM storage slot packing ($256$-bit boundaries).
3. Compute and display the optimal variable ordering, alongside the calculated slot savings.

🎯 Acceptance Criteria

• Command correctly identifies sub-optimal storage layouts across contract inheritance hierarchies.
• Displays before/after storage slot visual maps in terminal output.

[isaac4real-art]

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[Aisha000-0]

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Hello, maintainer i can fix this issue

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[Hunterly01]

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[Sadeequ]

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[flexocode442]

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@Sadeequ's PR #680 was approved and merged by @mijinummi.

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