hydromodpy.physics.flow.flow_runtime_fields

Field declarations for the Boussinesq runtime knobs on FlowConfig.

This mixin exposes the 13 flat runtime_* / vi_* / ts_vi_* fields kept on FlowConfig for backward-compatible TOML payloads. The mixin keeps the field declarations isolated so flow_config.py focuses on the user-facing payload (param_list, param, bc, ic, sinks_sources).