Add a current conditions block to the briefing/data-package

docs/internal/briefing.md

@@ -22,6 +22,8 @@ Outputs:
 
 - `briefing.Package` with common metadata and one report-specific content
   object for Daily, 3-Day, Weekend, or Storm Report
+- optional `currentConditions` prompt context from normalized
+  `/conditions/current` data when available
 - optional JSON file written by `briefing.Save`
 
 ## Boundaries
@@ -36,6 +38,8 @@ The package receives configured units and timezone from the app layer. Daypart
 configuration is consumed by `internal/forecast` before briefing builders run.
 Configured `location` values are prompt context only; Weather API
 `sourceLocationId` and `sourceLocation` remain source provenance.
+Current conditions are copied from the normalized `/conditions/current` bundle
+source only; observation station and timestamp fields remain provenance.
 
 ## External Adapters Used