Round 38: add --penalty_lam flag to cifar_resmlp.py for Mode 2 cross-method test

Patches:
- main(): add --penalty_lam (separate from CB's bridge temperature args.lam)
- train_dfa block update (line 195): add penalty_lam * (f_l**2).sum(-1).mean()
- train_state_bridge block update (line 326): same penalty
- train_credit_bridge block update (line 533): same penalty

Codex round 38 GO STAGE: keep penalty separate from CB lam, blocks-only,
sanity-check that hidden_norms remain nontrivial (not silencing the blocks).

2-epoch smoke (results/round38_smoke_sbcb_pen) passes the silencing check:
SB ||h_L||=229, CB ||h_L||=1258, both nontrivial. Deep cosines positive across
all layers for SB ([0.28, 0.25, 0.23]) and rising for CB ([0.04, 0.08, 0.13, 0.15]).

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

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