{
  "schema_version": 1,
  "selection": {
    "contemporary_effect_count": [0, 2],
    "material_effect_count": [2, 3],
    "seed_strategy": "stable hash of subject, exact text, palette, and layout",
    "preserve_across_retries": true
  },
  "effects": [
    {
      "id": "imperfection_ink_density",
      "name": "Uneven ink density",
      "range_percent": [6, 12],
      "applies_to": ["image plate", "large display type", "solid shape"]
    },
    {
      "id": "imperfection_dry_edge",
      "name": "Dry-ink edge breakup",
      "range_percent": [1, 4],
      "applies_to": ["large display type", "image silhouette", "solid shape"]
    },
    {
      "id": "imperfection_halftone_drift",
      "name": "Halftone density drift",
      "range_percent": [5, 10],
      "applies_to": ["screened image", "halftone field"]
    },
    {
      "id": "imperfection_registration_drift",
      "name": "Registration drift",
      "range_mm": [1, 3],
      "applies_to": ["two-ink plate", "one-ink second impression"]
    },
    {
      "id": "imperfection_broken_gesture",
      "name": "Broken manual gesture",
      "gap_percent": [4, 12],
      "applies_to": ["loop", "underline", "arrow", "ruled gesture"]
    }
  ],
  "guardrails": [
    "Never alter supplied wording or factual information.",
    "Never move the dominant object, headline anchor, or core grid.",
    "Never reduce display-text readability below thumbnail scale.",
    "Never create an additional ink color.",
    "Apply registration drift only to image or display plates, never microcopy."
  ]
}