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cogen: decorrelate per-ray KISS seeds across seeds, MPI ranks and batches (fixes #2807) - #2808

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fix-2807-per-ray-seeding

Oct 18, 2026

Merged

cogen: decorrelate per-ray KISS seeds across seeds, MPI ranks and batches (fixes #2807)#2808
willend merged 12 commits into
mainfrom
fix-2807-per-ray-seeding

Commits on Oct 17, 2026
- cogen: decorrelate per-ray KISS seeds across seeds, ranks and batches (#2807)
  
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- cogen: make _uid unique across GPU batches and MPI ranks
  
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Commits on Oct 18, 2026
- Fix RNG test expectation
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- ADR: per-ray RNG seeding and _uid in generated ray-trace loops (#2807)
  
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- ADR: link mccode-antlr issue #392
  
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- ADR: wording
  
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- Size particle randstate by RANDSTATE_LEN
  
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- Update Test_SAXS (8) and templateSANS_Mantid references for #2807
  
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- Update McStas test references for #2807; more statistics where needed
  
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- Test_Dispersion_relation_TAS: move the %Scan off the dispersion edges
  
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- Merge branch 'main' into fix-2807-per-ray-seeding
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- Merge branch 'main' into fix-2807-per-ray-seeding
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