PR for Issue #36 and #37

[Levi-Ojukwu]

Linked Issue

Closes #36
Closes #37

Description

Implemented the full submission and review flow for Build Quests in the QuestEngine, enabling learners to submit proof and employers to review and trigger payouts.

What changed?

• Added submit_proof function for learners to submit IPFS proof hashes
• Added review_submission function for employers to approve/reject submissions
• Implemented escrow payout logic from QuestEngine to learner on approval
• Added submission status tracking (Pending, Approved, Rejected)
• Emitted relevant events (ProofSubmitted, SubmissionReviewed)
• Added unit tests covering submission and review flows

Why was it changed?

• To enable end-to-end lifecycle for Build Quests
• Ensures learners can submit work and receive payment upon approval
• Prevents duplicate submissions and double payouts

How was it implemented?

• Enforced authentication using require_auth() for both learner and employer
• Validated quest state (active, correct type) before allowing submission
• Stored submissions using (learner, quest_id) as unique key
• Ensured submission uniqueness and proper state transitions
• Implemented conditional payout logic using token transfer from contract escrow
• Updated and persisted submission status after review

[drips-wave]

@Levi-Ojukwu Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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