paper v2.34.3: fix Figure 4 cross-arch verdict matrix (data + layout)

User flagged Figure 4 issues. Found three problems:

1. **Row 4 (no-terminal-LN ResMLP) (d) frozen** was encoded as 0 (passes)
   but the actual data is no-outln DFA acc 0.327 ± 0.012 (3-seed) vs
   frozen baseline 0.349 ± 0.002 → margin -2.2 pp, beyond the 2 pp
   threshold → (d) FIRES. Updated to 1 (WB).

2. **Row 5 (CNN BN) cells (c) and (d)** were encoded as 0 (passes) but
   the CNN audit (results/protocol_audit/audit_cnn_3seed.json) only
   measured (a) and (b); there is no CNN frozen baseline and no CNN
   stability run. Showing them as ✓ was misleading. Added a third color
   (gray, "—") for "not measured" and marked CNN (c)+(d) accordingly.

3. **Layout** had massive empty vertical space below the panels with
   the key-finding text floating far below. Compressed:
   - figsize (11, 4.2) → (11, 3.2) [tighter aspect ratio]
   - Key-finding text moved from axes-coordinates y=-1.55 (way below
     plot) to figure-coordinates y=-0.05 (directly under panels)
   - BP panel title clarified: "BP-trained: protocol passes" →
     "BP-trained: protocol passes everywhere"

Also marked ViT-Mini (c) and no-LN ResMLP (c) as "not measured" since
neither has a saved cross_batch_stability value (the audit_cnn,
audit_d512, snapshot_vit_v1, and snapshot_no_outln_v1 files don't
include this diagnostic).

New verdict matrix:
                    (a) (b) (c) (d)
  ResMLP-d256 LN    WB  WB  ✓   WB
  ResMLP-d512 LN    WB  WB  ✓   WB
  ViT-Mini          WB  WB  —   WB
  ResMLP-d256 no-LN WB  ✓   —   WB   ← row 4 (d) was wrong
  CNN BN            WB  ✓   —   —    ← row 5 (c)+(d) were misleading

Key finding "(b) only fires on terminal-LN architectures" is unchanged
and now visually clearer (rows 1-3 have WB in (b), rows 4-5 have ✓).

Page impact: total page count 19 → 18 (the more compact figure
reclaimed an entire page). §1-§7 main content still fits on 9 pages.

Updated docstring with full data sources for each row.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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