Reuse weather API readiness response

docs/internal/collect.md

@@ -11,6 +11,10 @@ semantics belong in [weather-data internals](weather-data.md).
 `config.Config`. It constructs the Weather API adapter from that configuration,
 calls `FetchBundle`, and returns `Result{Bundle: *weatherdata.Bundle}`.
 
+The adapter's successful readiness request for current conditions is reused as
+that normalized source; collection does not trigger a second identical current
+conditions request.
+
 The package wraps adapter construction failures, including an invalid Weather
 API base URL, as weather-collection setup errors and fetch failures as
 bundle-collection errors. It does not retry, persist, select reports, derive