Add a new narrative forecast module and remove the unimplemented daily forecast stub

docs/integrations/weatherapi.md

@@ -89,10 +89,6 @@ source-specific `missing_source.sources` policy:
 - `discussion` for `/discussion`
 - `weather_story` for `/weatherstories/latest`
 
-The adapter also creates a missing stub source record for `daily` because that
-source slot exists in the internal bundle but is not fetched from the Weather
-API.
-
 Policy behavior:
 
 - `error`: fail the fetch for that source