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Master overview (PHASE4_1_PREPRODUCTION_HARDENING.md) covering all 27 substantive items, plus REMOTE_AND_SELF_PACED_ARCHITECTURE.md (reviews what already works for remote/self-paced delivery - student-driven provisioning, cohort-less students, idle-reaper-destroy-then-continue - and the one real gap: student authentication, explicitly Phase 5 scope, not built here). Updated PRODUCTION_NETWORK_SECURITY.md (the Gateway-to-Lab gap is now RESOLVED, with the full design writeup and a new control-plane-vs-data-plane section), PRODUCTION_DEPLOYMENT.md (four-cert TLS bundle), PRODUCTION_VALIDATION_CHECKLIST.md (Router mTLS check, admission control checks), PHASE4_PRODUCTION_INFRASTRUCTURE.md and ENGINEERING_SOP.md and LAB_ARCHITECTURE.md (stale 'known gap' pointers updated to point at the resolution), BACKUP_DR.md (destructive drill), README.md and platform/README.md (Phase 4.1 pointers, lab-router component, updated known-limitations). Also fixes a real pre-existing bug found while auditing what gets committed: infra/.gitignore's patterns were written repo-root-relative (e.g. "infra/terraform/...") but the file lives in infra/, so git resolved them relative to THAT directory and none of them ever matched anything - a real .terraform/ provider cache showed up as untracked when it should have been ignored. Fixed by dropping the redundant leading "infra/" from every pattern. Status: PHASE 4.1 COMPLETE / PRE-PRODUCTION HARDENING COMPLETE / READY FOR HARDWARE DEPLOYMENT.