Release v3.20.0

Changed

• The CLI now bundles Screenplay 4.37.0 and Stage 4.18.1, and cratis run defaults to the matching Stage image.

Fixed

• cratis render explains why a model whose events declare several generations cannot be rendered yet: alongside Stage's STAGE-ESM-016, it reports CLI-RENDER-003 naming the evolved event. The command fails with a validation error and writes nothing. Screenplay itself validates such models; Stage does not yet accept their executable model (ESM v4).