Paper A v13 rev9: sensitivity surface + honesty fixes (GPT-5.5 hostile review)

Pre-emptively address the three residual points from a hostile GPT-5.5
reviewer pass that rev8 had not fully closed (the rest of that review
matched the already-applied fusion revision):

- Sensitivity surface (Major 5): new Figure 6 maps the deployed rule over
  the full (cosine cut x dHash cut) plane - clean-group flag rate and the
  Firm A-minus-B/C/D contrast. Shows no cliff at (0.95, dHash<=5), contrast
  >45pp across a broad region (58pp at 0.97/dHash<=3), and that extending to
  the MC bound (dHash<=15) halves the contrast - so the thresholds are not
  cherry-picked and the weaker MC band is shown, not hidden. Reproducible
  via make_fig6_sensitivity.py (DB columns only).

- Soften "reuse-dominated" (Major 1): the assertion that Firm A "is" a
  reuse-dominated population now reads "behaves in the screen as," explicitly
  resting on interviews + byte-identity rather than per-signature ground
  truth; two other uses made conditional/generic.

- Shared-pipeline contamination of ICCR (Major 2): Sec III-E now names the
  shared within-firm imaging pipeline (scanners, PDF assembly, red-stamp
  removal) as a channel that can lift the inter-CPA rate above true chance,
  distinct from "shared template," supported by the Sec V-B pipeline audit;
  bias direction (higher floor) keeps the Firm-A contrast conservative.

rev9 docx rebuilt (6 figures embedded).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qn59FdF9JMyfFg3sjcUNNG

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2026-06-23 14:59:55 +08:00

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paper/Paper_full_v13_filled_rev9_20260623.docx

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