Module ab_testing 

A/B Testing Framework

A/B testing for model/prompt comparisons with deterministic assignment, atomic metrics collection, and statistical winner determination.

Structs

AbTest

An active A/B test comparing two or more variants.

AbTestRegistry

Central registry that manages the lifecycle of multiple A/B tests.

Assignment

A recorded session→variant assignment.

Variant

A single experiment variant with routing metadata.

VariantMetrics

Atomic per-variant statistics accumulated during the test.