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feat: Phase C C4 similarity-neighbor distribution report -- novelty shortcut visibility for benchmark audits - #883

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feat/c4-similarity-neighbor-report
Jul 10, 2026
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feat/c4-similarity-neighbor-report

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Implements C4 from NEXT_100_PR_MAP: similarity-neighbor distribution report for novelty honesty.

What

  • src/openamp_foundry/evidence/similarity_neighbor_report.py: compute_similarity_report() + format_similarity_report() + SimilarityNeighborReport dataclass
  • SIMILARITY_SHORTCUT_THRESHOLD = 0.80 -- fraction above which a sequence is high-similarity to references
  • SHORTCUT_FRACTION_THRESHOLD = 0.50 -- if >50% of positives are high-similarity, novelty_shortcut_likely=True
  • 63 tests; BASELINE 6898 to 6961

Why

Makes novelty shortcut visible and auditable: benchmark improvements may reflect similarity to known AMPs, not genuine novelty discovery.

Disconfirming pass

  • Similarity metric is positional only; NOTICE included in formatted output.
  • Report is evidence, not policy; does not block anything.
  • No safety/release policy touched.

@cschanhniem
cschanhniem merged commit d6812a5 into main Jul 10, 2026
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cschanhniem added a commit that referenced this pull request Jul 10, 2026
…hortcut visibility for benchmark audits (#883) (#884)

Co-authored-by: OpenCode <opencode@example.com>
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