fix(deployment): delete NotDeployed instances centrally without a site round-trip

A NotDeployed instance has no live Instance Actor at any site, so Delete is a pure
central-side record cleanup. Transport-imported instances always land NotDeployed
(often against an uncommissioned/unreachable site); a site round-trip made them
undeletable until the site came online. Short-circuit the site call for NotDeployed.

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

tests/ZB.MOM.WW.ScadaBridge.DeploymentManager.Tests/DeploymentServiceTests.cs

@@ -454,6 +454,25 @@ public class DeploymentServiceTests : TestKit
         Assert.Contains("not found", result.Error);
     }
 
+    [Fact]
+    public async Task DeleteInstanceAsync_NotDeployed_RemovesRecordWithoutSiteRoundTrip()
+    {
+        // #05-T18: a NotDeployed instance has no live actor at any site (Transport-
+        // imported instances always land NotDeployed, often against an uncommissioned
+        // or unreachable site). Delete must succeed as a central-side record cleanup
+        // WITHOUT contacting the site. The default _service's CommunicationService has
+        // no actor wired, so any attempted site round-trip throws uncaught -- a Success
+        // result therefore proves the site was never contacted (Times.Never, enforced
+        // structurally).
+        var instance = new Instance("ImportedInst") { Id = 70, SiteId = 1, State = InstanceState.NotDeployed };
+        _repo.GetInstanceByIdAsync(70, Arg.Any<CancellationToken>()).Returns(instance);
+
+        var result = await _service.DeleteInstanceAsync(70, "admin");
+
+        Assert.True(result.IsSuccess);
+        await _repo.Received(1).DeleteInstanceAsync(70, Arg.Any<CancellationToken>());
+    }
+
     // ── DeploymentManager-004: site-success but central-delete-failure must not escape uncaught ──
 
     [Fact]