Cutting another trial release

This is still completely unproven. I'm concentrating more on the overall architecture and working verification in the background. Consider this a Validation release only. Use this to evaluate the ergonomics and requirements of the project, not the correctness or performance.

Full Changelog: v0.1.0...v0.2.0

LLVM/MLIR toolchain llvmorg-22.1.8

Static LLVM/MLIR prefix built by .github/workflows/toolchain.yml. Consumed by CI via .github/actions/restore-llvm-toolchain. Not a product release.