PAPER_OUTLINE: round 20 language tightening + 5 validation summary

§4 updates per round 20:
  - Soften 'confirmed' to 'strongly supports'
  - Add §4.4 BP+penalty capacity-cost control with the round 20 phrasing:
    'lower bound on residual gap under matched architecture/data/optimizer/
    penalty, after accounting for the penalty's direct capacity cost in BP'
  - Add multi-seed lock-in to §4.3 (24 measurements all near zero)
  - List 5 independent validations supporting the converged framing

The §4 narrative is now complete and the framing is locked.

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