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`initialized natural build` looked like a third defect on main: sonnet began implementation before the attended concept checkpoint, three runs in a row. It is flaky, not broken, and the measurement setup was the larger problem. A run that stops to put the concept to the user before building takes about 579s on sonnet. A run that skips the checkpoint and fails the assertion finishes in 130-200s. The suite capped each test at 300s, so the thorough path was killed as a timeout and the hasty path was graded as a result: the cap was selecting for the behavior the scenario exists to forbid. Raised to 900s, with the reasoning recorded next to the number so it is not trimmed back as a mystery constant. The baseline is corrected accordingly: the scenario is flaky (1 of 4), not failing, and readers are told to check a duration against the cap before calling a slow failure a behavioral one. Written with AI assistance (Claude Code). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>