feedkit: split the former maximumdirect.net/weatherd project in two.

feedkit now contains a reusable core, while weatherfeeder is a concrete implementation that includes weather-specific functions.

event/doc.go

@@ -0,0 +1,8 @@
+// Package event defines the domain-agnostic event envelope used by feedkit-style daemons.
+//
+// The core idea:
+//   - feedkit infrastructure moves "events" around without knowing anything about the domain.
+//   - domain-specific code (weatherfeeder, newsfeeder, etc.) provides a concrete Payload.
+//
+// This package should NOT import any domain packages (weather model types, etc.).
+package event