Add §2/§3 hero figure: 5-method audit horizontal bar chart

4-panel layout (one per diagnostic), 5 methods sorted bottom-to-top by
ascending accuracy, color-coded healthy (BP/EP, blue) vs degenerate
(DFA/SB/CB, red), with threshold lines drawn:

  (a) max per-block growth (log scale, threshold 50x)
  (b) ||g_L|| (log scale, floor 1e-7)
  (c) cross-batch stability (linear, ceiling 0.30)
  (d) headline acc (linear, frozen baseline 0.349)

The visual layout makes it immediately obvious that:
  - (a) and (b) cleanly split healthy from degenerate (4-7 OOM gap)
  - (c) is bimodal and doesn't cleanly split — confirms it's a sub-mode
    discriminator, not a primary detector
  - (d) shows BP above the frozen baseline by ~25 pp while DFA/CB/SB
    are at or below it

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