The lab is now a build-along mirroring what actually happened: ten
stages, each with the goal, the divergences, a see-it-work check, and
the errors genuinely hit while building (empty Migration error from a
broken model import, the migration-guard KeyError, the missing Lucide
icon, nested-app-context test writes, Decimal sums, and the authz
sweep catching the deliberately open kiosk take). That last one gets
its explicit EXEMPT_ENDPOINTS entry with a pointer to the decision
record - the net stays, the exception is reviewable. Full suite: 993
backend tests, 49 vitest, frontend build, naming hook, all green.
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