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

internal/briefing/derived_modules_test.go

@@ -194,6 +194,15 @@ func derivedModuleContext(id report.ID) ModuleContext {
 		derivedHour("2026-05-29T12:00:00-05:00", "Thunderstorms with gusty wind", 80, 96, floatPtr(101), 42),
 		derivedHour("2026-05-29T13:00:00-05:00", "Heavy rain", 70, 82, nil, 30),
 	}
+	narrative := []weatherdata.ForecastPeriod{
+		{
+			Name:            "Today",
+			StartTime:       mustParseModuleTime("2026-05-29T06:00:00-05:00"),
+			EndTime:         mustParseModuleTime("2026-05-29T18:00:00-05:00"),
+			TextDescription: "Morning storms, then partly sunny.",
+			TemperatureF:    floatPtr(81),
+		},
+	}
 	summary.Dayparts[2].AlertOverlaps = []forecast.AlertOverlap{{Event: "Severe Thunderstorm Watch"}}
 	return ModuleContext{
 		Resolved: report.Resolved{
@@ -202,11 +211,19 @@ func derivedModuleContext(id report.ID) ModuleContext {
 			Timezone:    "America/Chicago",
 			ValidPeriod: summary.Period,
 		},
+		Collected: facts.CollectedFacts{
+			Narrative: &weatherdata.ForecastRun{
+				IssuedAt: mustParseModuleTime("2026-05-29T10:30:00-05:00"),
+				Product:  "narrative",
+				Periods:  append([]weatherdata.ForecastPeriod(nil), narrative...),
+			},
+		},
 		Derived: facts.DerivedFacts{
-			ValidPeriodHourlyPeriods: hours,
-			DailySummaries:           []forecast.DailySummary{summary},
-			DaypartSummaries:         append([]forecast.DaypartSummary(nil), summary.Dayparts...),
-			PrecipTiming:             forecast.BuildPrecipTiming(hours),
+			ValidPeriodHourlyPeriods:    hours,
+			ValidPeriodNarrativePeriods: narrative,
+			DailySummaries:              []forecast.DailySummary{summary},
+			DaypartSummaries:            append([]forecast.DaypartSummary(nil), summary.Dayparts...),
+			PrecipTiming:                forecast.BuildPrecipTiming(hours),
 		},
 		Units:    "us",
 		Timezone: "America/Chicago",