Implement Player Quest History Mapping

[Mkalbani]

Description

There is no on-chain record of which quests a player has participated in or completed.

Expected Behavior

Each player's quest history should be queryable directly from the contract.

Proposed Changes

mapping(address => uint[]) public playerQuestHistory;

Update completeQuest() to push the quest ID into the player's history.

Acceptance Criteria

• Player history is recorded on completion
• History is publicly queryable by address
• Tests validate history is updated correctly

[JoaquinSkorg]

@JoaquinSkorg has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer, kindly assign this issue to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @JoaquinSkorg to this issue.

[drips-wave]

Congratulations, @JoaquinSkorg! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @JoaquinSkorg: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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