Signed Compression Progress on a Sealed Audit is Goodhart-Resistant

In three linesTheoretical paper proves compression-based reward (sealed-audit loss decrease) is Goodhart-resistant: if r_t = E(θ_{t-1}) - E(θ_t), cumulative reward telescopes exactly to true audit improvement. For finite panels, empirical deviation bounded by 2Δ_n(F,δ). Authors mechanize proof in Lean 4 and validate on ARC-TGI grid-transformation tasks.

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