Add bidirectional scan (correctness path) with definition gate - #6

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feature/bidirectional-scan

Commits on Jul 14, 2026

Commits on Jul 15, 2026

docs: torch.compile OOMs at L=8192 (Step 6); note artifact-loss failure mode
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docs: bidirectional speedup research — roofline says share the exp
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feat(kernel): fused bidirectional scan, scalar path (Stage 1) — shares Pass A
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fmt: rustfmt line-wrapping in fused bidirectional
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fix(clippy): iterate a_row instead of range-indexing in fused Pass A
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feat(kernel): NEON fused bidirectional scan (Stage 2) — shares exp across directions
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fmt: rustfmt line-wrapping in fused NEON bidirectional
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fix: profiler discretize_chunk signature; scale-relative f32 tolerance
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feat: wire fused bidirectional to Python + benchmark (Stage 3), ABI 4->5
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fmt: rustfmt let-else wrapping in bidirectional FFI
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