Improve rewrite framing with formula-level read tracking#948
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It adds form/exnpost folding and formula read-analysis utilities, exposes statement-logic read extraction in ecLowPhlGoal, and updates ecPhlRewrite to build rewrite obligations from the actual framed precondition and written variables instead of relying on coarser statement-wide equality assumptions. Also increases test coverage for the proc change tactic. Co-Authored-By: Gustavo Delerue <gxdelerue@proton.me>
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It adds form/exnpost folding and formula read-analysis utilities,
exposes statement-logic read extraction in ecLowPhlGoal, and
updates ecPhlRewrite to build rewrite obligations from the
actual framed precondition and written variables instead of
relying on coarser statement-wide equality assumptions.