Validate precipitation probabilities and ice wording

internal/adapters/weatherapi/client.go

@@ -228,6 +228,9 @@ func (b *bundleBuilder) fetchHourly(ctx context.Context) error {
 		if !period.HasUsableTimeBounds() {
 			return fmt.Errorf("hourly forecast from %s has unusable time bounds for period %d", source.Endpoint, i+1)
 		}
+		if !period.HasValidPrecipitationProbability() {
+			return fmt.Errorf("hourly forecast from %s has invalid precipitation probability for period %d", source.Endpoint, i+1)
+		}
 	}
 	source.IssuedAt = &hourly.IssuedAt
 	source.UpdatedAt = hourly.UpdatedAt

internal/adapters/weatherapi/client_test.go

@@ -112,6 +112,22 @@ func TestFetchBundleFromFixtures(t *testing.T) {
 	}
 }
 
+func TestFetchBundleRejectsInvalidHourlyPrecipitationProbability(t *testing.T) {
+	for _, probability := range []string{"-1", "101"} {
+		t.Run(probability, func(t *testing.T) {
+			server := fixtureServer(t, map[string]handlerOverride{
+				"/forecast/hourly": {status: http.StatusOK, body: `{"data":{"periods":[{"startTime":"2026-05-29T13:00:00Z","endTime":"2026-05-29T14:00:00Z","probabilityOfPrecipitationPercent":` + probability + `}]}}`},
+			}, nil)
+			client := newTestClient(t, server.URL+"/", nil)
+
+			_, err := client.FetchBundle(context.Background())
+			if err == nil || !strings.Contains(err.Error(), "invalid precipitation probability") {
+				t.Fatalf("FetchBundle() error = %v, want invalid precipitation probability", err)
+			}
+		})
+	}
+}
+
 func TestFetchBundleBuildsExpectedQueries(t *testing.T) {
 	var requested []string
 	server := fixtureServer(t, nil, &requested)