nordisk/holger

docs/v1

• FEATURES.md
• HOLGER-V2.md
• README-v1.md
• SLSA.md
• SUPPLY-CHAIN.md
• demo-airgap.md
• estate-approvers.md
• estate-health-words.md
• scanner-signature-bundles.md
• secure-update-gateway-limitations.md
• secure-update-gateway-mvp.md
• secure-update-gateway-operator-guide.md
• secure-update-gateway-threat-model.md
• security-review-2026-09-11.md