feat: load packet logs from configured source

scripts/verify-go-mcp.ps1

@@ -84,8 +84,15 @@ func main() {
 	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
 	defer cancel()
 
+	if err := os.Unsetenv("ISPHERE_PACKET_LOG_FILE"); err != nil {
+		fail("server/env", err)
+	}
+
 	serverTransport, clientTransport := mcp.NewInMemoryTransports()
-	server := mcpserver.NewServer()
+	server, err := mcpserver.NewServerFromEnv()
+	if err != nil {
+		fail("server/config", err)
+	}
 	serverErr := make(chan error, 1)
 	go func() {
 		serverErr <- server.Run(ctx, serverTransport)
@@ -183,6 +190,7 @@ func main() {
 		"tools": toolNames,
 		"helper_name": helperName,
 		"receive_message_count": len(messagesValue),
+		"packet_log_file_configured": os.Getenv("ISPHERE_PACKET_LOG_FILE") != "",
 		"real_isphere_login_required": false,
 		"python_runtime_required": false,
 		"action_tools_present": false,
@@ -229,6 +237,7 @@ func fail(step string, err error) {
         tool_count = $script:harnessJson.tool_count
         tools = $script:harnessJson.tools
         receive_message_count = $script:harnessJson.receive_message_count
+        packet_log_file_configured = $script:harnessJson.packet_log_file_configured
         python_runtime_required = $false
         real_isphere_login_required = $false
         action_tools_present = $false