v0.4.23

• wet_snow_annual() returns each year's ERA5-Land snow from cd's annual layers, such as peak snow water equivalent and the 50 % melt date, over one watershed's dissolved polygons, 1950–2025 (#121). Its example reads Maxan Creek's outline and cd's layers, bundled in inst/extdata/snow_pilot/. scripts/departure_snow.R regresses the Maxan pilot's Chinook window flows on them: more peak snow and a later melt mean more migration-window flow at every series, and snow explains almost nothing in the spawning window (research/station_flow_departure.md).