Why: Backend PR #62 merged as 3f438b9 (superseded by #64/#65); task card requires re-pinning the gitlink to the backend merge commit before the Dev PR can merge. Evidence: backend go vet + go test ./... -count=1 all ok (29 packages); merged tree content-identical to backend main. Impact: modules/backend 685bd0d -> 3f438b9. Refs: .task/fix-pg-boolean-columns.md
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@ 8e66bce0f9