EVIDENCE_SUMMARY: §4 fully rewritten under locked two-distinct-modes framing

§4 now reflects all 5 independent validations of the converged framing:
  1. Direct deep cos on penalized DFA (3 seeds): +0.155 ± 0.025
  2. Null calibration with fresh Bs: +0.002 ± 0.022 (real signal)
  3. Hypothesis B disambiguation (vanilla early ep): -0.008 ± 0.013
  4. BP+penalty 2×2 control: 17 pp residual = credit quality
  5. Multi-seed lock-in: 24 measurements all near zero

Round 20 language tightening applied:
  - 'lower bound on non-capacity gap' instead of 'clean isolation'
  - Explicit caveats about end-to-end vs local-loss difference
  - Counter to 'different optimization regime' objection

The §4 framing is locked. Five independent validations done. Stop
iterating, start writing.

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