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/kind.go

@@ -0,0 +1,30 @@
+package event
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Kind identifies the "type/category" of an event for routing and policy decisions.
+//
+// Kind is intentionally open-ended (stringly-typed), because different daemons will
+// have different kinds:
+//
+//	weatherfeeder: "observation", "forecast", "alert"
+//	newsfeeder:    "article", "breaking", ...
+//	stockfeeder:   "quote", "bar", "news", ...
+//
+// Conventions (recommended, not required):
+//   - lowercase
+//   - words separated by underscores if needed
+type Kind string
+
+// ParseKind normalizes and validates a kind string.
+// It lowercases and trims whitespace, and rejects empty values.
+func ParseKind(s string) (Kind, error) {
+	k := strings.ToLower(strings.TrimSpace(s))
+	if k == "" {
+		return "", fmt.Errorf("kind cannot be empty")
+	}
+	return Kind(k), nil
+}