review(Driver.AbLegacy.Cli): add FlushLogging() to command finally blocks

Re-review at 7286d320. -008 (Low): all four commands now FlushLogging() in finally (parity
with AbCip.Cli; subscribe could drop shutdown log lines) + IL-inspection test.

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Cli/Commands/ProbeCommand.cs

@@ -58,6 +58,9 @@ public sealed class ProbeCommand : AbLegacyCommandBase
         finally
         {
             await driver.ShutdownAsync(CancellationToken.None);
+            // Driver.AbLegacy.Cli-008 — flush Serilog before process exit so buffered
+            // log output emitted during driver shutdown is not lost.
+            FlushLogging();
         }
     }
 }

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Cli/Commands/ReadCommand.cs

@@ -52,6 +52,9 @@ public sealed class ReadCommand : AbLegacyCommandBase
         finally
         {
             await driver.ShutdownAsync(CancellationToken.None);
+            // Driver.AbLegacy.Cli-008 — flush Serilog before process exit so buffered
+            // log output emitted during driver shutdown is not lost.
+            FlushLogging();
         }
     }
 

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Cli/Commands/SubscribeCommand.cs

@@ -93,6 +93,11 @@ public sealed class SubscribeCommand : AbLegacyCommandBase
                 catch { /* teardown best-effort */ }
             }
             await driver.ShutdownAsync(CancellationToken.None);
+            // Driver.AbLegacy.Cli-008 — flush Serilog before process exit so buffered
+            // log output emitted during driver shutdown is not lost.  Particularly
+            // important here: subscribe runs until Ctrl+C; without this, lines logged
+            // during shutdown can be silently dropped.
+            FlushLogging();
         }
     }
 }

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Cli/Commands/WriteCommand.cs

@@ -62,6 +62,9 @@ public sealed class WriteCommand : AbLegacyCommandBase
         finally
         {
             await driver.ShutdownAsync(CancellationToken.None);
+            // Driver.AbLegacy.Cli-008 — flush Serilog before process exit so buffered
+            // log output emitted during driver shutdown is not lost.
+            FlushLogging();
         }
     }