Round 26: fill in §1 Introduction prose (3 paragraphs) via codex

Codex round 26 produced 3 substantive paragraphs for §1, replacing the
3 thin placeholder sentences. Each paragraph follows round 23's
prescription:
  P1: claim sentence + numerical evidence (DFA 0.306 < frozen 0.349;
      layer-0 +0.42 vs deep ~0; ||g_L|| ~ 5e-10 < eps clamp 1e-8) +
      closing 'measurement regime must be valid'
  P2: 5-method audit shows the two modes; intervention dissociation
      (lambda=1e-4 alleviates Mode 1 not Mode 2; vanilla ep 1 has
      meaningful ||g|| but deep cos still ~0) + closing
  P3: methodological contribution framing + cite Paleka, O'Bray,
      Jordan + closing roadmap

Compiles cleanly. PDF still has §2-§7 with topic sentences only (TODO
next via per-section codex rounds).

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