feat: [U4] backend codegen verification, compare mask fold, demo - #33
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Adds the codegen layer to the test suite: codegen_check.py runs llc and fails if any lowered operation stops reaching SIMD, gated on an x86-registered target so builds without it skip rather than fail. Folds compare-then-sext into the mask the handler already computes, so the field-mask idiom never materializes an illegal <K x i1>. Excluded for padded shapes, where the mask still owes the narrowing shuffle. Also adds demo/ (end-to-end run wired into CI), ROADMAP.md, README updates, and drops a stray checked-in .pyc.
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Adds the codegen layer to the test suite: codegen_check.py runs llc and fails if any lowered operation stops reaching SIMD, gated on an x86-registered target so builds without it skip rather than fail.
Folds compare-then-sext into the mask the handler already computes, so the field-mask idiom never materializes an illegal . Excluded for padded shapes, where the mask still owes the narrowing shuffle.
Also adds demo/ (end-to-end run wired into CI), ROADMAP.md, README updates, and drops a stray checked-in .pyc.
closes #30