batch-integration

Batch effects between samples will dominate a learned geometry if they are not removed first, so this fixture supplies the integration step for cohort-scale single-cell work. harmonypy and scanorama take different approaches, and pinning both keeps the choice open and comparable.

Two Bioconda packages, locked green. As with ann-backends-environment, pairing alternatives for one pipeline slot is what holds the fixture at L3 rather than L4.