Add scout constellation mode for APK venue persona packs.

Cluster 3+ scout_report hits on the same SSID within 10 minutes; server infers airport/campus/retail venue class and pushes persona spread_policy. Emberwake weather-map merges active scout biomes. Includes agent, server API, and Vitest coverage.

agent/deploy/scout_wifi_test.go

@@ -0,0 +1,17 @@
+package deploy
+
+import (
+	"os"
+	"testing"
+)
+
+func TestScoutWiFiSSIDFromEnv(t *testing.T) {
+	t.Setenv("AETHERFORGE_WIFI_SSID", "  Airport-Lounge  ")
+	if got := ScoutWiFiSSID(); got != "Airport-Lounge" {
+		t.Fatalf("ssid=%q", got)
+	}
+	_ = os.Unsetenv("AETHERFORGE_WIFI_SSID")
+	if got := ScoutWiFiSSID(); got != "" {
+		t.Fatalf("expected empty, got %q", got)
+	}
+}