springai/basic: explain why run()'s systemPrompt parameter is unused

@WorkflowInit requires the constructor and the @WorkflowMethod to
share a parameter list, so run(String) must take systemPrompt even
though only the constructor uses it. Add a comment so readers don't
trip over the apparent unused parameter (and so static analyzers
that flagged it have an explanation in-source).

Addresses Copilot review on PR #775.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: donald-pinckney

TASK_QUEUE.json

@@ -55,8 +55,8 @@
       "line": 103,
       "reviewer": "copilot-pull-request-reviewer",
       "question": "run(String systemPrompt) doesn't use its systemPrompt parameter.",
-      "status": "unaddressed",
-      "note": "It IS used — via @WorkflowInit the same argument is passed to the constructor. @WorkflowInit requires matching signatures between the constructor and @WorkflowMethod, so the parameter can't be dropped. Reply explaining this, or add a brief comment in run()."
+      "status": "addressed",
+      "note": "Added a comment in run() explaining that @WorkflowInit requires matching parameter lists between the constructor and the @WorkflowMethod, and that the constructor consumed the prompt."
     },
     {
       "file": "springai/multimodel/src/main/java/io/temporal/samples/springai/multimodel/MultiModelApplication.java",

springai/basic/src/main/java/io/temporal/samples/springai/chat/ChatWorkflowImpl.java

@@ -91,7 +91,9 @@ public ChatWorkflowImpl(String systemPrompt) {
 
   @Override
   public String run(String systemPrompt) {
-    // Wait until the chat is ended
+    // systemPrompt is unused here on purpose — @WorkflowInit requires the constructor
+    // and the @WorkflowMethod to share a parameter list, and the constructor above
+    // already consumed it to build the chat client.
     Workflow.await(() -> ended);
     return "Chat ended after " + messageCount + " messages.";
   }