{
  "schemaVersion": "1.0.0",
  "benchmark": "AI Text Watermark Remover literal artifact coverage",
  "scope": "Deterministic Unicode and formatting artifact inspection only",
  "limitations": "These fixtures do not test statistical model watermarks or prove AI authorship.",
  "measurementBoundary": "Deterministic fixture coverage only. No fixed false-positive rate is claimed because a representative multilingual corpus has not been calibrated.",
  "languageEligibility": {
    "eligible": "Literal code-point inspection in any language when the character rule is context independent.",
    "excludedFromAutomaticCleaning": ["Mixed-script visible lookalikes", "Language-significant selectors or fillers when context is uncertain", "Any provider-level statistical signal"],
    "fixtureContextRequired": ["Mongolian variation selectors", "Hangul fillers"]
  },
  "fixtures": [
    { "id": "zero-width-space", "label": "Zero-width space U+200B", "kind": "zero-width", "input": "water\u200bmark", "expectedCleaned": "watermark", "removable": true },
    { "id": "word-joiner", "label": "Word joiner U+2060", "kind": "zero-width", "input": "clear\u2060text", "expectedCleaned": "cleartext", "removable": true },
    { "id": "direction-control", "label": "Right-to-left override U+202E", "kind": "directional", "input": "safe\u202etext", "expectedCleaned": "safetext", "removable": true },
    { "id": "unicode-tag", "label": "Unicode tag U+E0061", "kind": "unicode-tag", "input": "plain\udb40\udc61 text", "expectedCleaned": "plain text", "removable": true },
    { "id": "variation-selector", "label": "Variation selector U+FE0F", "kind": "variation-selector", "input": "text\ufe0f", "expectedCleaned": "text", "removable": true },
    { "id": "invisible-filler", "label": "Hangul filler U+3164", "kind": "invisible-filler", "input": "two\u3164words", "expectedCleaned": "two words", "removable": true },
    { "id": "halfwidth-hangul-filler", "label": "Halfwidth Hangul filler U+FFA0 outside Hangul context", "kind": "invisible-filler", "input": "two\uffa0words", "expectedCleaned": "two words", "removable": true },
    { "id": "mongolian-fvs4", "label": "Mongolian variation selector U+180F outside Mongolian context", "kind": "variation-selector", "input": "clear\u180ftext", "expectedCleaned": "cleartext", "removable": true },
    { "id": "soft-hyphen", "label": "Soft hyphen U+00AD", "kind": "soft-hyphen", "input": "water\u00admark", "expectedCleaned": "watermark", "removable": true },
    { "id": "bom", "label": "Byte-order mark U+FEFF", "kind": "bom", "input": "clean\ufefftext", "expectedCleaned": "cleantext", "removable": true },
    { "id": "special-space", "label": "Non-breaking space U+00A0", "kind": "non-breaking-space", "input": "two\u00a0words", "expectedCleaned": "two words", "removable": true },
    { "id": "control", "label": "Bell control U+0007", "kind": "control", "input": "safe\u0007text", "expectedCleaned": "safetext", "removable": true },
    { "id": "homoglyph", "label": "Cyrillic lookalike U+0430", "kind": "homoglyph", "input": "p\u0430ypal", "expectedCleaned": "p\u0430ypal", "removable": false }
  ]
}