go.mod moved to go 1.27.3 in 775b2b0b, but the OSS Scanner image still started
from golang:1.27.2 with GOTOOLCHAIN=local, so its build refused the module.
Anthropic's OSS Scanner builds .oss-scanner/Dockerfile from this repository
and audits the image offline. The image keeps the source, the Go module and
npm caches, the debug panel binary, Xray-core and the sidecars, so tests,
the xray gRPC e2e suite, the master+node e2e and a live panel all run with
the network disabled. threat_model.md lists the trust boundaries, entry
points and the severity rubric the scanner should report against.