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Support Lean 4.30 and 4.31 #1

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@sv

Lentil pins Lean v4.28.0. Please bump (or add CI coverage) for v4.30.0
and v4.31.0 so downstream projects on recent toolchains can require
Lentil instead of vendoring it.

The semantic core — Basic.lean, Util.lean, Utils/{MetaUtil,SyntaxUtil,MiscLemmas}.lean
— is Mathlib-free (Lean + Batteries only) and compiles unmodified under
v4.30.0 in our downstream build, so this looks like a lean-toolchain +
Batteries pin bump rather than a source change. (We haven't exercised
ProofMode, so that may need separate checking.)

Happy to open a PR with the toolchain/manifest bump.

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