`cargo-fuzz` harness for entry-points

[YaronZaki]

• Difficulty: advanced · Effort: M · Impact: protocol robustness
• Expected Outcome
  Fuzz corpus committed; CI smoke-fuzz loop runs 60s/entry-point.
• Acceptance Criteria
  • Crash corpus persisted.
• Files / Modules Affected
  • new fuzz/ directory per contract.
• Dependencies: after #51.

[oyinade247]

I would to work on this please

[LaGodxy]

Can I take this please?

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #249)
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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@LaGodxy's PR #351 was approved and merged by @YaronZaki.

🏆 @LaGodxy: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (627 total points). Track your full progress on GrantFox.

👏 Great work, @LaGodxy! Keep contributing to Quantarq.