PAPER_OUTLINE: §4 rewrite under 'two distinct failure modes' framing

After the round 19 disambiguation experiment confirmed hypothesis B
(penalty CREATES deep alignment, not just reveals it), the paper §4
needs to use the new framing:

  Mode 1: measurement degeneracy via terminal LN gradient cancellation
  Mode 2: low intrinsic credit-direction quality of random feedback

Both modes are direct-measured (mode 1 by diagnostic (b), mode 2 by
per-layer cos in the meaningful regime). The penalty partially
alleviates BOTH modes. Neither is fully fixed.

§4 rewrite includes:
  - The two modes (4.1)
  - Penalty causal validation with 3-seed cos (4.2)
  - Disambiguation: vanilla early-epoch cos table proving hypothesis B (4.3)
  - Why the residual gap is partial alignment (4.4)
  - Why this framing is paper-cleaner than prior ones (4.5)

Walk-back chain extended to 7 entries, with 6 and 7 happening same-day
and converging on the final two-distinct-modes framing.

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