feat(inbound-api): executor threads the trace flag; endpoint honours ApiMethod.TraceAllCalls

Flow Debugger (design 2026-09-05 §5.2): InboundScriptExecutor.ExecuteAsync gains a trailing
trace parameter that builds the script's Route helper WithTrace(trace); the inbound endpoint
passes method.TraceAllCalls so a flagged integration method is traced on every real call.

Claude-Session: https://claude.ai/code/session_01GSLkkHKz9JrAtmJjmQK3cP

src/ZB.MOM.WW.ScadaBridge.InboundAPI/InboundScriptExecutor.cs

@@ -330,7 +330,10 @@ public class InboundScriptExecutor
         // Deliberate ordering: this optional parameter trails the CancellationToken
         // because it was appended additively for non-breaking contract evolution.
         // Every call site passes it by named argument (parentExecutionId:).
-        Guid? parentExecutionId = null)
+        Guid? parentExecutionId = null,
+        // Flow Debugger (design 2026-09-05 §5.2): trace the routed site runs this method makes.
+        // Additive; the endpoint passes ApiMethod.TraceAllCalls, the Flow Debugger passes true.
+        bool trace = false)
     {
         // Keep the timeout source and the request-abort source
         // separable. A single linked CTS makes a genuine client disconnect
@@ -396,7 +399,8 @@ public class InboundScriptExecutor
                 parameters,
                 route.WithDeadline(cts.Token)
                      .WithRequestAborted(cancellationToken)
-                     .WithParentExecutionId(parentExecutionId),
+                     .WithParentExecutionId(parentExecutionId)
+                     .WithTrace(trace),
                 dbHelper,
                 cts.Token);