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++
 

agent/miner/pool_test.go

@@ -55,15 +55,13 @@ func TestDifficultyToTargetHexTwo(t *testing.T) {
 	for i, j := 0, len(padded)-1; i < j; i, j = i+1, j-1 {
 		padded[i], padded[j] = padded[j], padded[i]
 	}
-	want := strings.ToLower(strings.Repeat("", 0)) // placeholder
-	_ = want
 	const hexdigits = "0123456789abcdef"
 	wantBytes := make([]byte, 64)
 	for i, v := range padded {
 		wantBytes[i*2] = hexdigits[v>>4]
 		wantBytes[i*2+1] = hexdigits[v&0x0f]
 	}
-	want = string(wantBytes)
+	want := string(wantBytes)
 	if out != want {
 		t.Fatalf("difficulty 2 target = %q, want %q", out, want)
 	}