Round 38 paper update: §4 + §5 + new Appendix K with SB+penalty 3-seed result

CODEX ROUND 39 VERDICT: PAPER-CHANGING for SB; wait for CB multi-seed for CB claims.

Round 38 3-seed SB+penalty (4-block d=256, 30ep, lam=1e-2):
- acc 0.453±0.003 (BEATS shallow baseline 0.349 by +10.4pp -- FIRST non-BP method)
- ||h_L||=302±8 (contained, not silenced)
- ||g_L||=1.8e-4 (HEALTHY)
- deep cos +0.322±0.007 (2x DFA+pen +0.155)
- deep rho +0.402±0.015 (5x DFA+pen +0.080)

Penalty rescue magnitudes (method-dependent):
- DFA: +5.5 pp (0.306 -> 0.363)
- SB:  +24 pp (0.213 -> 0.453)
- CB:  +15 pp (single seed, multi-seed in flight)
- BP:  -8 pp (capacity cost, 0.609 -> 0.530)

Paper updates:
- §4 ¶4 NEW: Mode 2 has method-dependent severity within fixed-feedback family;
  SB+penalty is the first audited non-BP method to substantively use deep blocks
  via intervention; deep cos doesn't predict acc across methods (methodological obs)
- §5 ¶3 EXTENDED: BP+penalty -> 3x penalty control (BP, DFA, SB) with all margins
  vs frozen-blocks baseline; BP-to-SB gap only 7.7 pp vs BP-to-DFA gap 17 pp
- Appendix K NEW: full SB+penalty 3-seed table with vanilla SB and DFA+pen
  comparison

Main content stays at 9 pages exactly (within E&D limit). Total 16 pages.

CB multi-seed (s123, s456) launched in parallel (PIDs 576938, 576939) — claims
deferred until those land.

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

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