Phase-3: Riemann hot-path decomposition into shared GPU device helpers#1572

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sbryngelson:phase3-riemann

Commits on Jun 12, 2026

bench: add per-solver Riemann benchmark variants
sbryngelson
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src: extract shared Riemann interface helpers (mixture, Reynolds, cylindrical source)
sbryngelson
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src: unify hypoelastic interface energy into a shared helper; delete dead solver copies
sbryngelson
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docs: document the GPU_ROUTINE helper pattern; record Phase-3 completion
sbryngelson
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build: fix per-target loop and vestigial lines in MFCTargets
sbryngelson
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src: delete the remaining validator-dead hypoelastic blocks in LF and HLLC; doc fixes
sbryngelson
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