feat(enrichment): detect Mixedbread and Sourcegraph local access tokens

[bohdansolovie]

Summary

• Add mixedbread_api_key rule for mxb_ + base62 body (min 20 chars) with broad tail guard
• Add sourcegraph_local_access_token rule for sgp_local_ + 40 hex (v3 local format) with broad tail guard
• Tests cover positives, truncation, -suffix, _suffix, and alpha continuation (fixed-length Sourcegraph local)

Test plan

• cd review-enrichment && npm run build && node --test test/secret-scan.test.ts (100 passing)

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

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

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Warning

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⏸️ Gittensory review result - manual review recommended

_{Review updated: 2026-07-05 04:31:49 UTC}

2 files · 1 AI reviewer · no blockers · readiness 73/100 · CI green · clean

⏸️ Suggested Action - Manual Review

Review summary
This change adds two high-confidence secret-scan rules and covers the main positive/truncation/continuation cases for both formats. The regexes are consistent with the surrounding rule style, and the tail guards correctly avoid partial matches on identifier-like continuations. I do not see a reachable correctness break in the diff.

Nits — 3 non-blocking

• nit: review-enrichment/test/secret-scan.test.ts:1194 only exercises the Mixedbread body with lowercase letters, so the advertised base62 body is not pinned for uppercase and digits.
• review-enrichment/test/secret-scan.test.ts:1194: add a Mixedbread positive fixture such as `mxb_Az09Az09Az09Az09Az09` so the test proves the full `[A-Za-z0-9]` contract, not just lowercase.
• 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	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low 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: 246 registered-repo PR(s), 152 merged, 9 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	bohdansolovie; Gittensor profile; 246 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: not available
• Official Gittensor activity: 246 PR(s), 9 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Explain no-issue PR.
• 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.

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