fix: CI version validation for CACHE STRING CMake format The `sed` regex for LEAN_VERSION_IS_RELEASE expected the line to end with `)` immediately after the number, but the line now has `CACHE STRING ""` after the value. Use `grep -oE` consistent with the other version extractions. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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