feat: redesign bench calibration (factor/offset), add Ttank/P2 displays, fix sensor calibration

- Replace P1-P6 rational transfer function with factor/offset model for bench params
- Add explicit rx/tx direction flags in bench XML configuration
- Add T.Tank (BenchTemp) and P2 (AnalogSensor2) to temperature/pressure display
- Apply SensorConfiguration calibration to pressure channels, fix empty sensors.xml fallback
- Add live value labels to flowmeter charts
- Hide pump live values and PSG encoder standalone label
- Add K-Line connection state model, improve KWP service and status displays
- Restructure .claude/skills into subdirectory format

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Views/UserControls/FlowmeterChartView.xaml

@@ -9,8 +9,13 @@
             <RowDefinition Height="*"/>
         </Grid.RowDefinitions>
 
-        <TextBlock Text="{Binding Title}" FontSize="11" FontWeight="SemiBold"
-                   Foreground="DimGray" Margin="4,0"/>
+        <StackPanel Orientation="Horizontal" Margin="4,0">
+            <TextBlock Text="{Binding Title}" FontSize="11" FontWeight="SemiBold"
+                       Foreground="DimGray"/>
+            <TextBlock Text="{Binding CurrentValue, StringFormat=F3}" FontSize="14" FontWeight="Bold"
+                       Foreground="#4080FF" FontFamily="Consolas" Margin="8,0,0,0"
+                       VerticalAlignment="Center"/>
+        </StackPanel>
 
         <lvc:CartesianChart Grid.Row="1" Height="120"
                             Series="{Binding Series}"

Views/UserControls/PumpIdentificationView.xaml

@@ -94,6 +94,8 @@
                 <StackPanel Grid.Column="1" VerticalAlignment="Center" Margin="6,0,0,0">
                     <Button Content="Read K-Line" Width="90" Margin="0,2"
                             Command="{Binding ReadKlineCommand}"/>
+                    <Button Content="Disconnect" Width="90" Margin="0,2"
+                            Command="{Binding DisconnectKLineCommand}"/>
                     <!-- Progress bar shown during K-Line read -->
                     <ProgressBar Value="{Binding ProgressPercent, Mode=OneWay}"
                                  Minimum="0" Maximum="100" Height="6"

Views/UserControls/StatusDisplayView.xaml

@@ -44,8 +44,11 @@
                                    Width="12" Height="12"
                                    HorizontalAlignment="Center" VerticalAlignment="Center"
                                    ToolTip="{Binding Description}"
+                                   ToolTipService.InitialShowDelay="150"
+                                   ToolTipService.ShowDuration="30000"
                                    SnapsToDevicePixels="True"/>
                         <TextBlock Grid.Row="1" FontSize="8"
+                                   Text="{Binding Index}"
                                    HorizontalAlignment="Center" VerticalAlignment="Center"
                                    Foreground="DimGray"/>
                     </Grid>