OPTION F polish pass: update abstract, §1 ¶2, §6 ¶3, §7 ¶2 with round 38-40 findings

Codex round 40 sequencing: A then F. OPTION F (polish) pass found 4 real issues:

1. Abstract: added narrow conditional-positive finding sentence about
   SB+penalty beating the shallow baseline + cos-vs-acc dissociation

2. §1 ¶2: replaced 'deep cosine can improve to about +0.16' (DFA-specific)
   with a fuller cross-method statement mentioning SB +0.32, CB +0.68, and
   the cos-vs-acc dissociation

3. §6 ¶3 (protocol asymmetry): added one sentence noting that the
   cross-method cos-vs-acc dissociation REINFORCES the necessity of keeping
   all four diagnostics separate

4. §7 ¶2 (limits): upgraded 'terminal-LN interpretation is observational
   rather than causal identification' to 'established causally on the
   audited residual ResMLP via the matched same-backbone no-terminal-LN
   control but not proven to extend beyond that architecture family' —
   reflects round 36 wording upgrade based on existing April 7 no_outln data

All four changes are prose-level updates driven by data that was already in
the paper. Main content still fits at 9 pages exactly (E&D limit).

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

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