Make controller input best-effort and harden OTA rollback.

Accel/tap use fire-and-forget ESP-NOW with a 10 ms FreeRTOS-safe cadence, OTA recovers from seq gaps and auto-reboots after success, and bootloader app rollback confirms after a stable boot.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/ble_measure.go

@@ -79,8 +79,8 @@ func measureBleStream(h hostConn, clientID, periodMs uint32, count int, tolMs, t
 		PeriodMs:  periodMs,
 		TolMs:     tolMs,
 	}
-	if periodMs < 8 || periodMs > 16 {
-		out.Error = "period_ms must be 8..16"
+	if periodMs < 10 || periodMs > 16 {
+		out.Error = "period_ms must be 10..16"
 		return out
 	}
 	if count < 2 {