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The vcgen tactic, split across the modules above.

• VCGen.Reduce — SymM head-redex reducer.
• VCGen.SpecDB — SpecTheorem instantiation, simp-side migration, and findSpecs lookup.
• VCGen.RuleConstruction — SymM rule constructors from spec/simp/split info.
• VCGen.Context — VCGenM, its Context/State, the bundle of pre-built rules.
• VCGen.EPost — exception-postcondition decomposition helpers.
• VCGen.Util — generic VCGenM helpers (introsHygienic, simpGoalTelescope, solveTrivialConjuncts).
• VCGen.RuleCache — VCGenM cache wrappers around the SymM rule constructors.
• VCGen.Entails — entailment-shaped goal decomposition (Triple unfolding, state/precondition intro, EPost and lattice steps).
• VCGen.Solve — the main solve step / SolveResult.
• VCGen.Driver — the worklist driver (work, emitVC, main, Result).
• VCGen.Frontend — the vcgen syntax + tactic elaborator + mkSpecContext.