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[GrantFox][High] Freeze storage key formats for upgrades #1377

Description

@greatest0fallt1me

Summary

Freeze storage key formats for upgrades

Why this matters

A contract upgrade must not silently reinterpret existing market or oracle state.

Scope

Inventory storage keys, add compatibility fixtures, and reject incompatible migrations explicitly.

Acceptance criteria

  • Every key family has a documented encoding.
  • Populated upgrade fixtures load without loss.
  • New keys cannot collide.
  • Migration tests cover empty, populated, and malformed state.

Validation

Add regression coverage for existing behavior, failure modes, authorization boundaries, and compatibility. The implementation must pass the repository CI checks.

Non-goals

  • Typo-only, formatting-only, or documentation-only changes.
  • Unrelated refactors or dependency upgrades.
  • Weakening existing security, authorization, CI, or production safeguards.

Contributor application

Before implementation, comment with relevant experience, a 1–4 bullet approach, and an estimate for opening the first draft PR. Wait for maintainer assignment before coding.

PR requirements

Use a feature branch, include Closes #<issue-number>, check every acceptance criterion, link criteria to code/tests, explain security and failure-mode considerations, and pass CI.

Reward-readiness

This is a substantive GrantFox campaign issue. Merge and CI success do not by themselves guarantee reward eligibility; final reward-readiness is determined by campaign review.

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