Design an IAM strategy for a 500-engineer organization across 100+ AWS accounts, implementing least privilege, role-based access, cross-account roles, and permission boundaries.
## Problem
Design an IAM strategy for a growing organization with 500 engineers across 100+ AWS accounts. The strategy must enforce least privilege, support cross-account access, handle machine identities for services, and maintain full auditability of all access.
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Design canvas, rubric, hints, and model solutions.