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nudge-SNR hypothesis refuted
The 50% single-shot sensitivity is MULTIPLICATIVE (near-marginal T2 dynamics'
state-sensitivity; signal and error scale with r together) — not additive
noise divided by 2r. cos ceiling ~0.88 at near-edge states is set by T2
truncation + state sensitivity (0.98 at deeply-contracted states). hr-0.2's
empirical wins are NOT estimator SNR. Hardware upside: algorithm indifferent
to r across 20x -> nudge amplitude free to fight ADDITIVE readout noise.
Surviving accuracy levers: kappa nbrake (Tikhonov, targets the real culprit),
tail-window averaging over argmin selection.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014FAPDWQ49M5Ye3NpTndTpn
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