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de_fallback_reason only told you the fallback happened (blank/psnr/oom/ capture_error), not the failing PSNR or frame index — that data existed as text inside the thrown error's message and was discarded on the way to telemetry. DrawElementVerificationError now carries structured frameIndex/failedDb/verifyThresholdDb; the orchestrator reads them via the new getDrawElementVerificationDetails helper instead of regexing message text, and both telemetry surfaces (the render_complete perfSummary path and the crash-survival RenderCaptureObservability mirror) emit de_fallback_failed_db / de_fallback_frame_index. Needed to distinguish "32dB vs the 32dB threshold, tune it" from "12dB real corruption, investigate" during the parallel-router soak — currently that distinction is invisible.