feat: Telegram fleet alerts, forge sigil scramble, UI polish, agent ops

- Calibrate: per-event Telegram/SMTP toggles, test notification, chat ID help
- Notify on agent connect/reconnect, offline/hashrate/rejection, forge complete
- Sigil scramble post-forge uniquification and Dispense Reveal ceremony
- Full system check, desktop push, BITS/host-binary persistence, Path Tracer
- Dashboard/Crucible visual polish, haptics, sacred geometry, mobile nav
- README documents alerts, sigil scramble, and pack-usb workflow
- USB bundle repacked via pack-usb.bat (AetherForge.exe + synced agent source)

server/internal/alerts/settings.go

@@ -0,0 +1,41 @@
+package alerts
+
+// Event toggles — all default true in server DefaultConfig.
+type EventToggles struct {
+	AgentConnect    bool
+	AgentReconnect  bool
+	AgentOffline    bool
+	HashrateDrop    bool
+	RejectionRate   bool
+	BuildComplete   bool
+}
+
+// Settings combines delivery credentials with per-event toggles.
+type Settings struct {
+	NotifyConfig
+	Events EventToggles
+}
+
+func NewSettings(nc NotifyConfig, ev EventToggles) Settings {
+	return Settings{NotifyConfig: nc, Events: ev}
+}
+
+// EnabledForAlertType maps evaluator alert types to toggles.
+func (s Settings) EnabledForAlertType(alertType string) bool {
+	switch alertType {
+	case "offline":
+		return s.Events.AgentOffline
+	case "hashrate_drop":
+		return s.Events.HashrateDrop
+	case "rejection_rate":
+		return s.Events.RejectionRate
+	default:
+		return true
+	}
+}
+
+const (
+	EventAgentConnect   = "agent_connect"
+	EventAgentReconnect = "agent_reconnect"
+	EventBuildComplete  = "build_complete"
+)