feat: add sanity checks to `register_sym_simp` This PR adds validation to the `register_sym_simp` command: - reject duplicate variant names - validate `pre`/`post` syntax by elaborating them via `elabSymSimproc` in a minimal `GrindTacticM` context, catching unknown theorem names and unknown theorem set references at registration time Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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