Prototype Usability Testing: Set a 5-Task Benchmark Before 2026 Launch

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Set a 5-task benchmark for prototype usability testing before 2026 launch. Define success criteria in writing and block sign-off if participants need facilitator rescue. Independent technical note mirroring the canonical version: https://u-x.academy/blog/prototype-usability-testing-set-a-5-task-benchmark-before-2026-launch.php