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[ET-L2] ET-2/ET-3: conversion is a decision procedure, not a proven decision #14

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@hyperpolymath

src/kernel/Anytype/Core/Conversion.idr:34 decides conversion as structEq (normalise s) (normalise t) — correct shape, but there is no soundness/completeness theorem connecting it to declarative conversion (ET-2), and no adequacy statement vs the intended model (ET-3). systemet's MECH-1 (Lean, PR #17) has the totality core + stability landed and records the exact remaining statements (defEq_iff_nf, decDefEq) as OPEN; when they land, this kernel should pin and cite them, or discharge its own Idris2-side proofs. Cites: ET-2, ET-3.

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