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.

sinks/sink.go

@@ -0,0 +1,16 @@
+package sinks
+
+import (
+	"context"
+
+	"gitea.maximumdirect.net/ejr/feedkit/event"
+)
+
+// Sink is an adapter that consumes a stream of domain-agnostic events.
+//
+// Sinks MUST respect ctx.Done() whenever they do I/O or blocking work.
+// (Fanout timeouts only help if the sink cooperates with context cancellation.)
+type Sink interface {
+	Name() string
+	Consume(ctx context.Context, e event.Event) error
+}