paper v2.37.1: abstract mentions nudging + training-loss confirmation

Earlier (during the page-budget-constrained polish loop) I tried to add
the nudging-test mention to the abstract but had to revert because it
pushed §7 onto p10. With page budget relaxed, re-attempting the update.

Old abstract sentence about Mode 2 dissociation:
  "...while Credit Bridge attains much higher deep BP cosine than DFA
  at the same final accuracy, a dissociation that motivates reporting
  layerwise credit quality jointly with a depth-utilization baseline."

New abstract sentence:
  "...while Credit Bridge attains roughly 4× DFA's deep BP cosine yet
  matches DFA's accuracy—a dissociation that single-step nudging and
  integrated training-loss decrease both confirm against the reverse
  cosine ordering, and that motivates reporting layerwise credit quality
  jointly with a depth-utilization baseline."

This now references the v2.33 functional triangulation in the abstract,
matching the §4 main-text framing. A reader of just the abstract now
sees the strongest form of the cos-vs-acc dissociation: it's not just
"CB has higher cos but same acc" (which could be a noisy single
measurement) but "three independent functional metrics rank the
methods opposite to deep cosine".

Page count: 20 (unchanged).

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

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