Return a typed error when a verifier stake amount is zero

[RUKAYAT-CODER]

Background

On deposit_verifier_stake, a zero stake is rejected with the generic Error::InvalidRewardAmount, which conflates two different failures. A zero (or otherwise invalid) verifier stake should return its own typed error so callers can distinguish a bad stake from a bad reward.

Files to modify (2)

• contracts/earn-quest/src/escrow.rs
• contracts/earn-quest/src/errors.rs

Acceptance Criteria

• Implemented across the listed files
• Unit/integration tests added or updated and passing
• No regression; follows project coding standards

[Tobi-8]

Can i be assigned to this
I have the knowledge and experience to handle this issue

[Ranjeet2063]

Hello! I'd like to work on this issue.

Execution Plan for Return a typed error when a verifier stake amount is zero:

• Root Cause Analysis: Trace the regression in EarnQuestOne/stellar_Earn and implement a clean, targeted patch without breaking existing contracts.
• Regression Test: Add a reproduction test case to ensure this bug never reoccurs in production.
• Zero Overhead: Clean atomic commit with 100% passing test suite.

Why assign me?

• Proven Proof-of-Work: Implement Wallet Connection System #1 contributor on Mova Store (28 merged Web3 PRs) and official ElizaOS contributor.
• Fast Turnaround: Dedicated to shipping a tested, production-grade PR within 12–24 hours.
• Zero Maintainer Burden: Self-documenting code with green CI and tests included so you don't spend time debugging.

Ready to deliver within 12–24h—please feel free to assign it to me!