Work order created: /home/tlswk/projects/callcenter-os/docs/opencode-packets/2026-07-08-packet-s1a-kps-go-toolchain-verification.md\n\nBLUF: Packet S1 settlement backend appears implemented, but backend-go/go.mod declares go 1.26 and standard go test currently fails with go1.26 toolchain not available. S1A asks the worker to normalize the Go toolchain path first, rerun tests without temporary -modfile hacks, then review/hotfix settlement edge cases such as negative pool_rate and pool_rate > 1.\n\nConstraints: preserve pre-existing dirty SMS/deploy/router work, do not print secrets, do not touch Mattermost/frontend/migrations/deploy/SMS unless compile error proves direct mismatch, do not commit/push.