chore: minor tweaks to `Sym.simp` test and benchmark This PR applies two minor tweaks: - `tests/bench/sym/simp_1.lean`: share-common the proof term before counting objects in `getProofSize`, so the reported size reflects the shared representation. - `tests/elab/sym_simp_3.lean`: use `>>` instead of `.andThen` when composing `Sym.Simp` methods. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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