Three roles (owner > admin > instructor), enforced server-side on every /api/admin/* route
via reusable middleware (requireOwner/requireAdminOrOwner/requireAnyInstructor) — the
frontend hides controls a role can't use, but that's UX, never the actual boundary. A plain
'instructor' is further scoped to cohorts assigned via the new cohort_instructors table
(requireCohortAccess/requireStudentCohortAccess); owner/admin bypass that check entirely.
Owner-only: instructor account lifecycle, audit log. Admin/owner: cohort/student CRUD,
curriculum assignment. Any instructor role (cohort-scoped for 'instructor'): dashboard,
cohort/student views, Prepare/Destroy Labs, provisioning. Deliberately NOT cohort-scoped:
the raw /api/admin/environments/:id/* routes (no cohort context in a bare environment id
without an extra Provisioner round trip on every call) — a plain instructor still has full
Lab control via the cohort/student-scoped routes instead, which already carry the check.
server.js wires the new persistent-session middleware (studentSession/instructorSession —
re-fetches the instructor row from Postgres every request, so a role change or
deactivation takes effect on the very next request with no separate revoke needed) and adds
a last-resort error handler so a DB error in any async route returns 500 instead of
crashing the process or leaking a stack trace.
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