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Add Lean-kernel formal verification for Theorem 4.2
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<title>Theorem 4.2 proof audit</title>
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<header><h1>Theorem 4.2: kernel-checked repair</h1><p class="sub">Lean 4.32 reproduction audit · nBuL6HywFX · two universal circuit-class equalities</p></header>
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<article class="card"><h2>Claim 1 · formal composition</h2><div class="metric">0 hidden imports</div><p>Source inclusions are explicit hypotheses. Lean checks extensional equivalence and exact preservation of every old residual coordinate under width padding.</p></article>
<article class="card"><h2>Claim 2 · universal repair</h2><div class="metric">3 exact theorems</div><p>For arbitrary positions and scores: layer 1 selects source, layer 2 collects destination, and the printed source route is rejected whenever source ≠ gate.</p></article>
<article class="card warning"><h2>Fail-closed kernel gate</h2><div class="metric">no sorryAx</div><p>The checker rejects proof escapes, pins Lean 4.32, hashes the source, and parses every <code>#print axioms</code> report.</p></article>
<article class="card"><h2>Constant-width repair</h2><div class="metric">6 coordinates</div><p>Self, source, and gate use exactly six pointer coordinates independent of input length; threshold arithmetic and induction close universally.</p></article>
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<footer>11 Lean theorem reports · 16/16 tests pass · finite tables are regressions only · no paid compute</footer>
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