Webhook-to-SSE gateway with hierarchical topic routing and signature verification

Add missing nixery deps for CI coverage check

check-coverage uses grep, awk, and tr, which aren't in a bare nixery
go image. Also stopped running go test twice — check-coverage already
runs it internally.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

+3 -1
+3 -1
.tangled/workflows/ci.yml
··· 9 9 dependencies: 10 10 nixpkgs: 11 11 - go 12 + - gnugrep 13 + - gawk 14 + - coreutils 12 15 13 16 steps: 14 17 - name: "Test with coverage" 15 18 environment: 16 19 CGO_ENABLED: "0" 17 20 command: | 18 - go test -coverprofile=coverage.out -covermode=atomic ./... 19 21 ./check-coverage