fix(ab-transport): trim-only CIP path canonicalisation, observe abandoned shared opens, no Forward Open after dispose during connect

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport.Tests/DeviceSessionPoolTests.cs

@@ -162,6 +162,7 @@ public sealed class DeviceSessionPoolTests
         b.ShouldBe(a);
         b.GetHashCode().ShouldBe(a.GetHashCode());
         (a with { CipPath = "1, 2" }).CipPath.ShouldBe("1,2");
+        new DeviceKey("plc1", 44818, "   ", "ControlLogix").CipPath.ShouldBe("");
 
         var pool = new DeviceSessionPool(new ManualTimeProvider());
         await using var la = pool.Acquire(a, Options());
@@ -170,6 +171,16 @@ public sealed class DeviceSessionPoolTests
         pool.EntryCount.ShouldBe(1);
     }
 
+    [Fact]
+    public void Whitespace_inside_a_cip_path_part_is_kept_so_a_typo_fails_loudly()
+    {
+        var typo = new DeviceKey("plc1", 44818, "1,2 3", "ControlLogix");
+        typo.CipPath.ShouldNotBe("1,23");                    // never silently slot 23 on another controller
+        typo.CipPath.ShouldBe("1,2 3");
+        Should.Throw<ArgumentException>(() => CipPath.EncodeRoute(typo.CipPath));
+        CipPath.EncodeRoute(new DeviceKey("plc1", 44818, " 1, 0 ", "ControlLogix").CipPath).ShouldBe(new byte[] { 0x01, 0x00 });
+    }
+
     [Fact]
     public async Task A_new_connection_waits_for_every_earlier_close_not_just_the_latest()
     {