Add shared/global contributor blacklist (#1425)

[tmimmanuel]

Summary

• Added shared/global contributor blacklist persistence via new migration-backed singleton table global_contributor_blacklist and DB read/write APIs.
• Wired global blacklist into repository settings resolution so effective settings are .gittensory.yml/DB + shared/global list.
• Added focused unit coverage for DB round-trip, resolution merge behavior, and a self-tune path regression guard.

Validation

• npm run db:migrations:check
• npm run typecheck
• npm test -- test/unit/contributor-blacklist.test.ts test/unit/focus-manifest.test.ts test/unit/selftune-readback.test.ts
• npm run test:unit

Closes #1425

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.37%. Comparing base (b5d575e) to head (5768d7f).
⚠️ Report is 6 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1531   +/-   ##
=======================================
  Coverage   95.37%   95.37%           
=======================================
  Files         199      199           
  Lines       21546    21557   +11     
  Branches     7791     7795    +4     
=======================================
+ Hits        20550    20561   +11     
  Misses        416      416           
  Partials      580      580           

Files with missing lines	Coverage Δ
src/db/repositories.ts	96.14% <100.00%> (+0.02%)	⬆️
src/settings/repository-settings.ts	100.00% <100.00%> (ø)
src/signals/focus-manifest.ts	98.19% <100.00%> (+<0.01%)	⬆️

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[superagent-security]

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

[gittensory-orb]

Caution

🟥🟥🟥🟥🟥🟥🟥🟥🟥🟥🟥🟥

🛑 Gittensory review — blocked

7 files · 1 AI reviewers · no blockers · readiness 55/100 · CI failing · blocked

🛑 Blocked

CI checks failing

• validate
• lint

Signal	Result	Evidence
Code review	✅ No blockers	1 reviewers, synthesized
Linked issue	✅ Linked	#1425
Related work	⚠️ 2 scoped overlaps	Top overlaps are listed below; lower-confidence bulk is hidden.
Review load	❌ 8/20	Readiness component derived from cached public PR metadata and labels; size label size:M.
Validation evidence	❌ 5/25	Cached preflight status is hold.
Open PR queue	❌ 3/10	48 open PR(s), 9 likely reviewable, 39 unlinked.
Contributor context	✅ Confirmed Gittensor contributor	tmimmanuel; Gittensor profile; 31 PR(s), 35 issue(s).
Gate result	✅ Passing	No configured blocker found.

Nits — 1 non-blocking

• Repository config was not parsed

Review context

• Author: tmimmanuel
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository registration is not available in the local Gittensory cache.
• Public profile languages: not available
• Official Gittensor activity: 31 PR(s), 35 issue(s).
• Related work: Items reference the same linked issue feat(anti-abuse): configurable contributor blacklist — auto-label + auto-close banned logins #1425. (issue #1425)
• Related work: Open PR work references issue feat(anti-abuse): configurable contributor blacklist — auto-label + auto-close banned logins #1425. (issue #1425)

Contributor next steps

• Review top overlaps.
• Add scope summary.
• Fix blocker.
• Expect slower review.
• Refresh registry data or choose a registered active repo.
• Check active issues and PRs before submitting.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Review load = cached public PR metadata such as size labels, changed paths, and preflight status.
• Open PR queue = repo-wide review pressure; it is not a PR 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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