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)

agent/miner/pool.go

@@ -237,6 +237,11 @@ func (p *Pool) worker(id int, engine *Engine) {
 				log.Printf("[miner] hash error: %v", err)
 				break
 			}
+			if hashHex == "" {
+				// Engine not yet initialised (seed still being set) — break out
+				// and let the outer loop re-snapshot the job once it is ready.
+				break
+			}
 			p.hashesTotal.Add(1)
 			nonce++