Round 38 CB+penalty multi-seed: confirm clean cos-vs-acc dissociation across 3 fixed-feedback methods

CB+penalty 3-seed (4-block d=256, 30ep, lam=1e-2):
- acc 0.360±0.003 (same as DFA+pen, 9pp below SB+pen)
- ||h_L||=5680±178, ||g_L||=1.9e-5 (HEALTHY)
- layer-0 cos +0.652±0.005
- deep cos +0.679±0.008 (4x DFA+pen, 2x SB+pen)
- deep rho +0.464±0.025 (6x DFA+pen)

Final 3-method rescue comparison:
  DFA+pen: acc 0.363, deep cos 0.155, deep rho 0.080
  SB+pen:  acc 0.453, deep cos 0.322, deep rho 0.402
  CB+pen:  acc 0.360, deep cos 0.679, deep rho 0.464

Clean cos-vs-acc dissociation:
- CB has 4x higher deep cos than DFA but SAME accuracy
- SB has intermediate deep cos but HIGHEST accuracy
- Alignment to BP gradient is NECESSARY but NOT SUFFICIENT for usable credit

Paper updates:
- §4 ¶4: now includes all 3 methods with numbers, adds 'cos is necessary but not
  sufficient' framing based on 3-method dissociation
- Appendix K: adds CB+pen 3-seed rows + vanilla CB baseline for comparison
- Main content still 9 pages exactly (within E&D limit)

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

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