paper v2.31.1: deep cos +0.155 → +0.151 (ground-truth re-measurement)

The paper had 3-seed penalized DFA deep cos at +0.155 ± 0.025, but
re-measuring on the saved checkpoints gives 0.1506 (mean of per-seed
deep means is 0.1507; pooled mean over 12 deep-layer values is 0.1506).
The std of 0.025 matches pooled ddof=1 ✓.

Same paragraph also had inconsistent values: "+0.155 ± 0.025" 3-seed
above, then "+0.165" single-seed s42 in the lambda sweep.  Unified to
3-seed throughout.

§5 ¶2 lambda sweep updates:
  lam=1e-4 ||h_L||  2.4e4 (s42 only) → 2.2e4 (3-seed mean)
  lam=1e-4 ||g_L||  6.3e-7 (s42)     → 7.0e-7 (3-seed)
  lam=1e-4 deep cos -0.022 (s42)     → -0.020 (3-seed)
  lam=1e-2 deep cos +0.165 (s42)     → +0.151 (3-seed, same as the
                                       three-seed value used elsewhere)

Other places updated: §4 ¶4 prose, Table 2, Appendix J Table 9
DFA+pen mean row (deep cos +0.155 → +0.151 and ||h_L||/||g_L||
columns updated to 30-ep dfa_pen_short means rather than the round-19
single-seed numbers), Appendix L paragraph.

Page layout preserved: 9 main pages, refs p10, 18 total, 0 overfull.

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

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