Add manual Storm Report generation

internal/promptinput/package.go

@@ -107,7 +107,7 @@ func Validate(pkg Package) error {
 	if pkg.Briefing.Metadata.ReportID != pkg.Report.ID {
 		return fmt.Errorf("briefing.metadata.reportId must match report.id")
 	}
-	if pkg.Briefing.Daily == nil && pkg.Briefing.ThreeDay == nil && pkg.Briefing.Weekend == nil {
+	if pkg.Briefing.Daily == nil && pkg.Briefing.ThreeDay == nil && pkg.Briefing.Weekend == nil && pkg.Briefing.Storm == nil {
 		return fmt.Errorf("briefing report content is required")
 	}
 	return nil

internal/promptinput/package_test.go

@@ -98,6 +98,33 @@ func TestBuildWeekendDataPackage(t *testing.T) {
 	}
 }
 
+func TestBuildStormDataPackage(t *testing.T) {
+	briefingPackage := validBriefingPackage()
+	briefingPackage.Metadata.RunID = "20260529T100000Z_storm"
+	briefingPackage.Metadata.ReportID = report.Storm
+	briefingPackage.Metadata.PromptID = "weather.storm_report"
+	briefingPackage.Daily = nil
+	briefingPackage.Storm = &briefing.Storm{
+		TimingWindow: briefingPackage.Metadata.ValidPeriod,
+		Hazards:      []string{"Thunderstorms"},
+	}
+
+	pkg, err := Build(briefingPackage)
+	if err != nil {
+		t.Fatalf("Build() error = %v", err)
+	}
+
+	if pkg.Report.ID != report.Storm {
+		t.Fatalf("Report.ID = %q, want storm", pkg.Report.ID)
+	}
+	if pkg.Report.PromptID != "weather.storm_report" {
+		t.Fatalf("PromptID = %q, want weather.storm_report", pkg.Report.PromptID)
+	}
+	if pkg.Briefing.Storm == nil {
+		t.Fatal("Briefing.Storm = nil")
+	}
+}
+
 func TestMarshalDeterministic(t *testing.T) {
 	pkg, err := Build(validBriefingPackage())
 	if err != nil {