Round 27: fill in §2 Audit prose (4 paragraphs) via codex

Codex round 27 produced 4 substantive paragraphs for §2, replacing thin
placeholders. Each paragraph follows round 23's prescription:
  P1: canonical setting (4-block d=256, AdamW, 100 ep, 3 seeds) +
      table/figure references
  P2: under field-standard reporting, all 5 methods look fine
  P3: EP internal comparison — same trustworthy measurement regime BUT
      EP depth contribution is also marginally negative (-3.3 pp vs
      frozen baseline). Honest about EP being trustworthy-measurement
      but neutral-depth-contribution (per round 27 prompt's caveat).
  P4: frozen-baseline comparison gives the walk-back: BP +26.6 pp, DFA
      -4.3 pp, SB -14.4 pp, CB -6.0 pp. Diagnostic split lines up with
      acc split.

Compiles cleanly. Next: §3 Failure Mode 1 prose via round 28.

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