feat(engine): add pickTopRankedOpportunities ranker helper

[kiannidev]

Summary

• Add pickTopRankedOpportunities(candidates, limit) to @jsonbored/gittensory-engine: ranks with the existing rankOpportunities ordering/tie-break rules, then returns the top N entries.
• Non-finite or negative limits fail closed to an empty list; limit is truncated to a non-negative integer.
• Export from the package barrel for miner/tool callers that need capped discovery output.

Why no linked issue

Small, self-contained engine helper — avoids every caller re-slicing rankOpportunities and duplicating limit sanitization. Pure data path; no CLI or hosted review wiring.

Conflict avoidance

Touches only packages/gittensory-engine/src/opportunity-ranker.ts, packages/gittensory-engine/src/index.ts (ranker export block), and ranker tests. Does not overlap open PRs touching miner CLI, enrichment analyzers, src/queue/processors, signals, or docs/grafana.

Codecov patch

Vitest exercises every new branch (top-N slice, empty input, zero/negative/non-finite limits, tie-break preservation, barrel export). Local diff-cover reports 100% patch coverage on the ranker diff.

Test plan

• npm run build --workspace @jsonbored/gittensory-engine
• npm run build:miner
• npx vitest run test/unit/opportunity-ranker.test.ts (52 tests)
• Typecheck fix: restored OpportunityRankInput import in ranker test
• diff-cover coverage/lcov.info --compare-branch=main --fail-under=99 → 100%
• CI validate / validate-code / codecov patch+project / orb review agent

Made with Cursor

[superagent-security]

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

[gittensory-orb]

Warning

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⏸️ Gittensory review result - manual review recommended

_{Review updated: 2026-07-05 03:05:00 UTC}

4 files · 1 AI reviewer · no blockers · readiness 55/100 · CI green · clean

⏸️ Suggested Action - Manual Review

Review summary
The AI review returned non-blocking notes for this change but did not include a separate narrative summary. Review the nits below before deciding this PR.

Nits — 5 non-blocking

• nit: test/unit/opportunity-ranker.test.ts:179 covers zero, negative, NaN, and positive infinity limits, but it does not pin the documented fractional truncation behavior such as limit 2.9 returning exactly two entries.
• nit: packages/gittensory-engine/test/opportunity-ranker.test.ts:118 only checks non-finite limits against NaN and positive infinity; adding negative infinity would make the dist-level contract match the fail-closed wording more completely.
• Add a focused assertion in test/unit/opportunity-ranker.test.ts:179 for pickTopRankedOpportunities(candidates, 2.9) returning the same two entries as limit 2.
• Add Number.NEGATIVE_INFINITY to the non-finite limit checks in packages/gittensory-engine/test/opportunity-ranker.test.ts:118.
• Readiness score is below the configured threshold — Use the readiness panel as advisory maintainer context; the score does not block this PR.

Signal	Result	Evidence
Code review	✅ No blockers	1 reviewer
Linked issue	⚠️ Missing	No linked issue or no-issue rationale found.
Related work	⚠️ 3 scoped overlaps	Top overlaps are listed below; lower-confidence bulk is hidden.
Change scope	❌ 8/20	High review scope from cached public metadata (no linked issue context).
Validation posture	❌ 5/25	Preflight is holding this PR: the review lane is unavailable, so it is not ready for automated review.
Contributor workload	✅ 10/10	Author activity: 1313 registered-repo PR(s), 629 merged, 49 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	kiannidev; Gittensor profile; 1313 PR(s), 49 issue(s).
Gate result	✅ Passing	No configured blocker found.

Review context

• Author: kiannidev
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository registration is not available in the local Gittensory cache.
• Public profile languages: TypeScript, MDX, C++, HTML, Rust
• Official Gittensor activity: 1313 PR(s), 49 issue(s).
• Related work: Titles/paths share 10 meaningful terms. (issue #2276, issue #2281)
• Related work: Titles/paths share 8 meaningful terms. (issue #2276, issue #2287)
• Related work: Titles/paths share 8 meaningful terms. (issue #2287, issue #2281)

Contributor next steps

• Explain no-issue PR.
• Review top overlaps.
• Add a concise scope and risk note.
• Await review-lane availability.
• Refresh registry data or choose a registered active repo.
• Link the issue being solved, or explicitly explain why this is a no-issue PR.
• Check active issues and PRs before submitting.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

---

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• Re-run Gittensory review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.87%. Comparing base (b4727d5) to head (9b5a693).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3328   +/-   ##
=======================================
  Coverage   93.87%   93.87%           
=======================================
  Files         277      277           
  Lines       30518    30522    +4     
  Branches    11112    11114    +2     
=======================================
+ Hits        28650    28654    +4     
  Misses       1211     1211           
  Partials      657      657           

Files with missing lines	Coverage Δ
...ckages/gittensory-engine/src/opportunity-ranker.ts	100.00% <100.00%> (ø)

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[gittensory-orb]

Gittensory approves — the gate is satisfied and CI is green.