Add penalty λ sweep figure: shows λ-dependence of (d) verdict

3-panel figure: vanilla DFA + penalty at λ=1e-3 (green) + penalty at
λ=1e-2 (blue):
  (a) ‖h_L‖: vanilla 4e8, both penalties ~4e4 (similar)
  (b) ‖g_2‖: vanilla 5e-10, penalties 7e-7 to 1e-6 (above floor)
  (c) acc: vanilla 0.31, λ=1e-2 0.36, λ=1e-3 0.37; horizontal lines
       at DFA-shallow 0.349 and 2pp threshold 0.371

Visual: at λ=1e-3 the test acc curve crosses ABOVE the 2pp threshold
line; at λ=1e-2 it stays below. This is the (d) lambda-dependence
finding from the round 18 follow-up.

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diff --git a/results/protocol_audit/figure_penalty_lambda_sweep.png b/results/protocol_audit/figure_penalty_lambda_sweep.png
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+++ b/results/protocol_audit/figure_penalty_lambda_sweep.png