SBOM, Hermetic Builds, and Enforceable Supply-Chain Policies

Implementation guidance is expanding across Syft/Trivy, Cosign/Notation, attested SBOM verification, Flux mirroring, KernelSbom, Yocto, Gubernator, Gradle dependency verification, and Artifact Keeper. New material adds hermetic notebook-image construction, offline dependency handling, Conforma validation, Docker hardening, and CRA workflows connecting SBOM/VEX data to exploit intelligence and accountable artifact ownership.