feat(suitbuilder): CD-tier filter helpers + tests; gate inventory-go build on go test

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

go-services/inventory-go/Dockerfile

@@ -2,6 +2,7 @@ FROM golang:1.25-bookworm AS build
 WORKDIR /src
 COPY . .
 RUN go mod tidy
+RUN go test ./...
 ARG BUILD_VERSION=dev
 RUN CGO_ENABLED=0 GOOS=linux go build \
     -trimpath -ldflags "-s -w -X main.buildVersion=${BUILD_VERSION}" -o /out/inventory-go .