feat: add `reprove` command for re-proving theorems with a specified tactic (#10434) This PR adds `reprove N by T`, which effectively elaborates `example type_of% N := by T`. It supports multiple identifiers. This is useful for testing tactics. 🤖 Generated with [Claude Code](https://claude.ai/code) --------- Co-authored-by: Claude <noreply@anthropic.com>
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