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/models/agent.go

@@ -117,10 +117,11 @@ type Share struct {
 }
 
 type HashrateSample struct {
-	ID        int64     `json:"id"`
-	AgentID   string    `json:"agent_id"`
-	Hashrate  float64   `json:"hashrate"`
-	Timestamp time.Time `json:"timestamp"`
+	ID          int64     `json:"id"`
+	AgentID     string    `json:"agent_id"`
+	Hashrate    float64   `json:"hashrate"`
+	GPUHashrate float64   `json:"gpu_hashrate,omitempty"`
+	Timestamp   time.Time `json:"timestamp"`
 }
 
 type Job struct {