feat(commons): additive Trace flag + ChildExecutionId/TraceEvents on route/call/write/change records

Flow Debugger (design 2026-09-05 §5.2/§5.4): Trace rides beside ParentExecutionId on
RouteToCallRequest/RouteToSetAttributesRequest/ScriptCallRequest/SetStaticAttributeCommand/
AttributeValueChanged; RouteToCallResponse and ScriptCallResult carry the site run's
ExecutionId and its ScriptTrace AuditEvents inline. All trailing optional — zero call-site edits.

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

src/ZB.MOM.WW.ScadaBridge.Commons/Messages/ScriptExecution/ScriptCallRequest.cs

@@ -9,9 +9,11 @@ namespace ZB.MOM.WW.ScadaBridge.Commons.Messages.ScriptExecution;
 /// null for normal (tag-change / timer-triggered) runs, nested <c>Script.Call</c>
 /// invocations, and any request built before the field existed.
 /// </param>
+/// <param name="Trace">Flow Debugger trace flag — see design 2026-09-05 §5.2. Additive; defaults to untraced.</param>
 public record ScriptCallRequest(
     string ScriptName,
     IReadOnlyDictionary<string, object?>? Parameters,
     int CurrentCallDepth,
     string CorrelationId,
-    Guid? ParentExecutionId = null);
+    Guid? ParentExecutionId = null,
+    bool Trace = false);

src/ZB.MOM.WW.ScadaBridge.Commons/Messages/ScriptExecution/ScriptCallResult.cs

@@ -1,7 +1,13 @@
+using ZB.MOM.WW.Audit;
+
 namespace ZB.MOM.WW.ScadaBridge.Commons.Messages.ScriptExecution;
 
+/// <param name="ExecutionId">Flow Debugger — the run's own <c>ExecutionId</c> (design 2026-09-05 §5.4). Additive; null from callers that predate the field.</param>
+/// <param name="TraceEvents">Flow Debugger — the run's <c>ScriptTrace</c> audit events in emission order when traced (design 2026-09-05 §5.4); null otherwise.</param>
 public record ScriptCallResult(
     string CorrelationId,
     bool Success,
     object? ReturnValue,
-    string? ErrorMessage);
+    string? ErrorMessage,
+    Guid? ExecutionId = null,
+    IReadOnlyList<AuditEvent>? TraceEvents = null);