fix(review): default cross-issue copycat/reward-farming dedupe on for reward-eligible repos - #9226
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…9033) copycatGateMode's absent-value fallback was a flat "off" for every repo (config-as-code only, no DB column), so the deterministic containment engine never ran unless a repo explicitly opted in via .loopover.yml -- a direct economic leak for a reward-eligible repo, since colluding accounts could file near-identical fixes and both merge undetected. resolveEffectiveCopycatGateMode resolves an unset mode to "warn" for a subnet-registered (reward-eligible) repo instead, so the engine runs and persists copycatScore/copycatMatchedPullNumber -- the signal the duplicate-cluster election needs. An explicit .loopover.yml value, including an explicit "off", always wins over this default.
…election (#9033) The duplicate-winner election (queue/duplicate-detection.ts) keyed entirely on shared linkedIssues overlap, so two PRs citing different issues -- one a near-identical copy of the other -- were never even considered duplicate-cluster candidates, letting both merge and both earn rewards independently. resolveCopycatDuplicateSibling (src/signals/copycat-duplicate.ts) bridges a PR's already-persisted copycat containment match into linkedIssueDuplicatePullRequestRecordsForGate and reconcileLiveDuplicateSiblings, so a cross-issue content match above the configured threshold now feeds the SAME winner-election, close- count, and live-staleness-reconciliation machinery a same-linked-issue duplicate already does. Scoped to still-open siblings only -- a match against an already-merged PR is left to copycatGateMode's own single-PR warn/label/block actuation. Every new parameter is optional and defaults to "never contributes a copycat sibling", so no existing caller's behavior changes.
… overlap (#9033) The duplicate_pr_risk gate finding -- the mechanism that actually holds or blocks a PR as a duplicate -- keyed strictly on shared linkedIssues overlap, so a cross-issue copycat containment match never surfaced here even after the duplicate-cluster election learned about it: the election could name a winner, but the loser's gate never actually failed on it. addPullRequestFindings now folds a PR's own persisted copycat containment match into the same overlap set a shared linked issue produces, treating it as corroborated by construction (a threshold- cleared content match is stronger evidence than a bare changed-file overlap). This is what makes the loser in a cross-issue reward-farming attempt actually get held/closed instead of merging independently.
…art by overlap (#9033) MAX_COPYCAT_CANDIDATES (25) capped how many prior-art candidates got their full patch content fetched and scored -- on an active repo, a copycat's actual match could sit past that cutoff and never get compared at all. Raised to 50 (still a bounded, cheap, single-repo-scoped set of D1 reads, not external API calls). The recently-merged phase also now ranks its path-overlapping candidates by OVERLAP COUNT descending before spending its share of the budget, rather than merely the most recently merged ones that happen to overlap at all -- a stronger prior signal of a genuine match, at no extra fetch cost since changedFiles is already loaded.
…ssion (#9033) Exercises the full confirmed scenario from #9033: two PRs on a reward- eligible repo, different linked issues, near-identical added code. Covers reward-eligible settings resolution, the duplicate-cluster helpers, the gate finding/conclusion, and the actual maintenance disposition -- proving the later cross-issue copycat PR is held for manual review (never merges independently) while the earlier claimant merges untouched on its own merits. Also documents an important existing interaction: #9129 already downgrades any gate failure caused solely by duplicate_pr_risk (even a corroborated one) to a neutral hold rather than an outright close, so the cross-issue copycat match now goes through that identical, precision-safe mechanism instead of bypassing it.
…te-decision twin (#9033) src/rules/advisory.ts's evaluateGateCheckCore gained a host-only cross-issue copycat corroboration branch (the duplicate-cluster election fix). It intentionally does not mirror into packages/loopover-engine/src/advisory/gate-advisory.ts -- the engine twin is deliberately kept slim (no signals/engine, no PullRequestRecord.copycatScore) so the miner/mcp CLI packages never drag that dependency graph in. Bumps the engine package version (the guard's own documented escape hatch for a one-sided fix, same shape as the precedent manual bump in 6aacf08), syncing package-lock.json, the miner's expected-engine.version pin, and the release-please manifest alongside it.
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Superagent didn't find any vulnerabilities or security issues in this PR. |
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This was referenced Jul 27, 2026
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Summary
Two colluding accounts (or one attacker with two identities) could file near-identical fixes under different linked issues and both merge — double reward for one piece of work.
Test plan
npx tsc --noEmit -p tsconfig.json --incremental false— cleanmain(picked up fix(orb): installation/permission/config integrity — suspension backfill, broker identity, numeric env validation, migration content hash #9222, feat(attest): pluggable attester seam with a deterministic sample implementation #9220 — no conflicts, re-verified)Closes #9033