Implement storage migration framework

[Levi-Ojukwu]

Description:

Contract upgrades may require storage schema changes. A migration framework would ensure safe transitions.

Why it matters: Storage migrations are required for protocol evolution.

Acceptance Criteria:

• Design migration interface
• Implement migration execution with rollback
• Add migration tests
• Document in docs/upgrade-guide.md

Relevant Files: scripts/migrate-v1-v2.ts, docs/upgrade-guide.md

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[isaac4real-art]

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[oniololade60-coder]

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[ololadedavidvictor-bit]

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can i work on this issue

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[yours-anjikon]

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Would love to work on it

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