Moved shared OpenMeteo time parsing code into a shared internal/providers/openmeteo library.

internal/sources/nws/observation.go

@@ -17,10 +17,6 @@ import (
 
 // ObservationSource polls an NWS station observation endpoint and emits a RAW observation Event.
 //
-// Key refactor:
-//   - Source responsibility: fetch bytes + emit a valid event envelope.
-//   - Normalizer responsibility: interpret raw JSON + map to canonical domain model.
-//
 // This corresponds to URLs like:
 //
 //	https://api.weather.gov/stations/KSTL/observations/latest
@@ -62,7 +58,7 @@ func (s *ObservationSource) Poll(ctx context.Context) ([]event.Event, error) {
 	}
 
 	// Event.ID must be set BEFORE normalization (feedkit requires it).
-	// Prefer NWS-provided "id" (stable URL). Fallback to a stable-ish computed key.
+	// Prefer NWS-provided "id" (stable URL). Fallback to a stable computed key.
 	eventID := strings.TrimSpace(meta.ID)
 	if eventID == "" {
 		ts := meta.ParsedTimestamp