feat(enrichment): unused-export / dead-on-arrival detector analyzer

[bohdansolovie]

Summary

• Adds unusedExport github-light analyzer that flags net-new direct exports with no non-declaration references.
• Parses added exports from the diff, checks same-file uses in the headSha file, then queries default-branch GitHub Code Search (total_count: 0 for brand-new PR exports is treated as dead-on-arrival).
• Reuses parseAddedExports; bounded symbol/search/file-fetch caps; fail-safe on missing token, fetch/search errors, or incomplete results.

Fixes #2025

Test plan

• cd review-enrichment && npm run build && npm run metadata
• node --test review-enrichment/test/unused-export.test.ts review-enrichment/test/analyzer-registry.test.ts
• CI green + Gittensory Orb approval

Made with Cursor

[superagent-security]

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

[loopover-orb]

Warning

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⏸️ Gittensory review result - manual review recommended

_{Review updated: 2026-07-05 18:09:31 UTC}

10 files · 1 AI reviewer · no blockers · readiness 80/100 · CI green · clean

⏸️ Suggested Action - Manual Review

Review summary
This adds a new `unusedExport` github-light analyzer that parses added direct exports from the diff (via the existing `parseAddedExports`/`exportedSymbols` helpers), rules out same-file references in the headSha file, and falls back to a bounded, repo-scoped GitHub Code Search to detect exports with zero external references (total_count 0, or a single hit confined to the declaring file). The implementation is well-bounded (symbol/search/file-fetch/finding caps), fails safe on missing token/headSha/search errors, and is wired consistently across registry.ts, analyzer-metadata.json, rees-analyzers.ts, enrichment-analyzer-names.ts, render.ts, types.ts, and .env.example with no drift between the four descriptor copies. Tests cover the dead/alive/incomplete-results branches of `isDeadOnArrivalFromSearch`, same-file reference detection, the max-searches cap, and the no-token fail-safe path, and CI (including codecov/patch) is green. Fixes the linked issue #2025 and stays narrowly scoped to the stated feature with no unrelated changes.

Nits — 5 non-blocking

• review-enrichment/src/analyzers/unused-export.ts: the `limits` values (10/10/25) are duplicated as literals in registry.ts, analyzer-metadata.json, and rees-analyzers.ts instead of being derived from the MAX_SYMBOLS/MAX_SEARCHES/MAX_FINDINGS constants, so a future tweak to the constants silently desyncs the docs/metadata.
• review-enrichment/src/analyzers/unused-export.ts:117 nests to depth 5 in the main scan loop (per the size-smell scan); consider extracting the per-candidate body into a helper for readability.
• isDeadOnArrivalFromSearch treats `total_count === 1` with an empty `items` array as dead-on-arrival (same as a same-file-only hit) — worth a comment noting that's an intentional fail-safe assumption rather than an oversight.
• The GitHub Code Search query only matches an exact quoted substring of the symbol name; common/short-ish names could still get false 'alive' hits from unrelated identical substrings in comments/strings — acceptable given MIN_SYMBOL_LEN=3, but worth a doc note since findings are reported as fact ('no references found').
• review-enrichment/src/analyzers/registry.ts / analyzer-metadata.json / rees-analyzers.ts: export the limits from unused-export.ts's constants (or a shared config object) so registry/docs can't drift from the analyzer's actual caps.

Signal	Result	Evidence
Code review	✅ No blockers	1 reviewer
Linked issue	✅ Linked	#2025
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low review scope from cached public metadata (1 linked issue).
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: 330 registered-repo PR(s), 191 merged, 9 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	bohdansolovie; Gittensor profile; 330 PR(s), 9 issue(s).
Gate result	✅ Passing	No configured blocker found.

Review context

• Author: bohdansolovie
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository registration is not available in the local Gittensory cache.
• Public profile languages: Python, C++, JavaScript
• Official Gittensor activity: 330 PR(s), 9 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Await review-lane availability.
• Refresh registry data or choose a registered active repo.

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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.16%. Comparing base (7d0e2c4) to head (295dd8c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3582   +/-   ##
=======================================
  Coverage   93.16%   93.16%           
=======================================
  Files         311      311           
  Lines       31750    31750           
  Branches    11612    11612           
=======================================
  Hits        29581    29581           
  Misses       1517     1517           
  Partials      652      652           

Files with missing lines	Coverage Δ
src/review/enrichment-analyzer-names.ts	100.00% <ø> (ø)

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[loopover-orb]

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