docs: add XML doc comments across src + Sister Projects section in CLAUDE.md

Bulk CommentChecker pass: fills in <param>/<inheritdoc> tags on public
APIs across all 23 src/ projects so the doc-coverage gate is green. Also
adds a Sister Projects section to CLAUDE.md pointing at the MxAccess
Gateway and OtOpcUa sibling repos, and gitignores local credential
captures (*login*.txt) and the wonder-app-vd03 deploy/ artifacts.

src/ScadaLink.Commons/Entities/Scripts/SharedScript.cs

@@ -2,12 +2,22 @@ namespace ScadaLink.Commons.Entities.Scripts;
 
 public class SharedScript
 {
+    /// <summary>Primary key.</summary>
     public int Id { get; set; }
+    /// <summary>Unique script name used to reference this script from templates.</summary>
     public string Name { get; set; }
+    /// <summary>C# script source code.</summary>
     public string Code { get; set; }
+    /// <summary>JSON-serialized parameter definitions, or null when the script takes no parameters.</summary>
     public string? ParameterDefinitions { get; set; }
+    /// <summary>JSON-serialized return type definition, or null when the script has no return value.</summary>
     public string? ReturnDefinition { get; set; }
 
+    /// <summary>
+    /// Initializes a new shared script with the required name and code.
+    /// </summary>
+    /// <param name="name">Unique script name.</param>
+    /// <param name="code">C# script source code.</param>
     public SharedScript(string name, string code)
     {
         Name = name ?? throw new ArgumentNullException(nameof(name));