concepts overview

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Concepts and contracts

These pages explain the design that the user guides rely on:

• Architecture: workflow boundaries, control flow, and extension rules.
• LUND data contract: in-memory records, serialized fields, splitting, and logs.
• Sampling models: exact uniform distributions, correlations, and random streams.
• External inputs: imported target geometry, detector files, and the Slurm worker script.

LUND files connect the two workflows: creation writes them, and the submitted GEMC jobs read them before COATJAVA reconstructs the detector output. Analysis of reconstructed events is outside both workflows.