feat(registry): enrich SN74 Gittensor — add miners leaderboard data artifact

[kiannidev]

Summary

Submit verified public endpoint at https://api.gittensor.io/miners/leaderboard.

Closes #723.

Validation

• Exactly one community candidate file changed
• npm run candidate:new + npm run validate:candidate passed
• npm run submission:pr passed (public_state: submit_pr, errors: [], manual_reasons: [])

[reviewwed]

Important

🔍 Manual review needed · manual-review

Decision — Routing to maintainer review — the reviewers did not reach a confident, unanimous merge. The target URL https://api.gittensor.io/miners/leaderboard is reachable (200 OK) but the fetch is flagged as degraded (near‑empty/JS‑only). Without a clear JSON data artifact response, we cannot confirm it satisfies the data‑artifact kind despite netuid corroboration. Manual review is needed to verify the endpoint returns the expected data.

Submission

• Netuid 74 · Kind data-artifact
• URL https://api.gittensor.io/miners/leaderboard
• Source https://api.gittensor.io/swagger-json

Independent reviews (dual-AI)

Reviewer A · gpt-oss-120b — 🔍 manual · 60%
The target URL https://api.gittensor.io/miners/leaderboard is reachable (200 OK) but the fetch is flagged as degraded (near‑empty/JS‑only). Without a clear JSON data artifact response, we cannot confirm it satisfies the data‑artifact kind despite netuid corroboration. Manual review is needed to verify the endpoint returns the expected data.

Reviewer B · nemotron-3-120b-a12b — ✅ merge · 93%
Leaderboard endpoint returns miner stats (data-artifact), corroborated by OpenAPI spec and chain identity for netuid 74; public-safe, functional, and not a duplicate.

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.