Formally prove the correctness of Sqrt.sol and Cbrt.sol#511

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dcmt/codex-prove-sqrt-cbrt

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Commits on Mar 11, 2026

test: add regressions from 27fd23a5 review
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fix: constant-fold leave-bearing switch in helper inlining, per-model norm reservation

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fix: skip dead code after leave in bare block (WS-L)

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fix: dead-code-aware reference analysis in _scope_references_any (WS2, 3/5)

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fix: helper scope frames, nested collection, duplicate detection, alpha-renaming (WS-K)

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fix: SSA count for zero-init returns + constant-fold in helper inlining (WS-J/WS-I partial)

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fix: constant-fold if/switch at parse time to allow dead-branch memory writes (WS-I)

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test: add regressions from fix review
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fix: 4 bugs from a3047843 review — nested homonym, rejected duplicates, switch leave

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fix: normalize exact selectors and helper shadowing
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refactor: centralize lean emission planning
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refactor: parse helper references by lexical scope
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Merge branch 'dcmt/newton-raphson-optimization' into dcmt/codex-prove-sqrt-cbrt
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