- PHASE5A_STUDENT_IDENTITY_REMOTE_CLASSROOM.md: the full design doc. - RUNBOOK_STUDENT_ACCOUNT_LIFECYCLE.md, RUNBOOK_REMOTE_CLASSROOM.md: operational runbooks. - REMOTE_AND_SELF_PACED_ARCHITECTURE.md: closes the 'no real student authentication' gap this doc previously flagged as the one item blocking self-paced delivery. - ENGINEERING_SOP.md §5 rewritten (was describing a pre-Phase-2A state no longer true of any deployed version of this codebase) plus a new §14; roadmap item 3 updated. - LAB_ARCHITECTURE.md, PRODUCTION_VALIDATION_CHECKLIST.md, README.md, platform/README.md: cross-references and a Phase 5A production-validation section.