// Package normalize provides an OPTIONAL normalization hook for feedkit pipelines.
//
// Motivation:
// Many daemons have sources that:
//  1. fetch raw upstream data (often JSON), and
//  2. transform it into a domain's normalized payload format.
//
// Doing both steps inside Source.Poll works, but tends to make sources large and
// encourages duplication (unit conversions, common mapping helpers, etc.).
//
// This package lets a source emit a "raw" event (e.g., Schema="raw.openweather.current.v1",
// Payload=json.RawMessage), and then a normalization processor can convert it into a
// normalized event (e.g., Schema="weather.observation.v1", Payload=WeatherObservation{}).
//
// Key property: normalization is optional.
// If no registered Normalizer matches an event, it passes through unchanged.
package normalize