. Add learner statistics aggregation

[DeFiVC]

What: Add functions that aggregate learner statistics across all courses.

Why: Dashboards need aggregate stats (total courses completed, average score, total rewards). Currently data is per-course.

Scope: Add get_learner_stats(learner) function returning: total courses enrolled, completed, average score, total rewards earned. Aggregate from multiple storage reads.

Acceptance criteria:

• Returns aggregate statistics
• Single function call
• Includes all relevant metrics
• No pagination needed

Technical context: contracts/progress-tracker/src/lib.rs — progress functions.

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[RaymondAbiola]

@RaymondAbiola has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Please can I work on this

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[Demilade10]

@Demilade10 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi I can fix this

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[dslegacy]

@dslegacy has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Good day team, can i handle this

ETA: 48 hrs max

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[nasirudeenbadirudeen87-cloud]

@nasirudeenbadirudeen87-cloud has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, reviewed the issue in detail. Full stack background with solid experience relevant to this task. No blockers on my end — I'm ready to submit a PR shortly. Please assign.

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[matthewester2014-jpg]

@matthewester2014-jpg has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I want to work on the issue.

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[Muyideen-js]

@Muyideen-js has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I can fix this

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[godwin-ifidon]

@godwin-ifidon has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, I’ve reviewed the issue and I’m interested in taking it up. I understand the expected outcome and would be glad to work on it and deliver a proper solution. Kindly assign it to me.

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[Chidimj]

@Chidimj has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello there Team, I would love the opportunity to work on this issue, i have gone through the project requirements and issue scope and i can get it done in max of 72 hours, thanks for the consideration.

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[drips-wave]

Congratulations, @Chidimj! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Chidimj: 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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[drips-wave]

This issue has been completed by @Chidimj as part of the Stellar Wave Program's 8th Wave 🥳

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