docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/Scripts/ScriptCompilationService.cs

@@ -69,6 +69,7 @@ public class ScriptCompilationService
     /// Returns a list of violation messages, empty if clean.
     /// </summary>
     /// <param name="code">The script code to validate.</param>
+    /// <returns>A list of trust-model violation messages; empty if the script is clean.</returns>
     public IReadOnlyList<string> ValidateTrustModel(string code)
     {
         var tree = CSharpSyntaxTree.ParseText(
@@ -243,6 +244,7 @@ public class ScriptCompilationService
     /// </summary>
     /// <param name="scriptName">The name of the script.</param>
     /// <param name="code">The script code to compile.</param>
+    /// <returns>A <see cref="ScriptCompilationResult"/> containing the compiled script on success, or error messages on failure.</returns>
     public ScriptCompilationResult Compile(string scriptName, string code)
         => CompileCore(scriptName, code, typeof(ScriptGlobals));
 
@@ -255,6 +257,7 @@ public class ScriptCompilationService
     /// </summary>
     /// <param name="name">The name of the trigger expression.</param>
     /// <param name="expression">The trigger expression to compile.</param>
+    /// <returns>A <see cref="ScriptCompilationResult"/> containing the compiled expression on success, or error messages on failure.</returns>
     public ScriptCompilationResult CompileTriggerExpression(string name, string expression)
         => CompileCore(name, expression, typeof(TriggerExpressionGlobals));
 
@@ -327,11 +330,13 @@ public class ScriptCompilationResult
 
     /// <summary>Creates a successful compilation result.</summary>
     /// <param name="script">The compiled script.</param>
+    /// <returns>A <see cref="ScriptCompilationResult"/> with <see cref="IsSuccess"/> set to <c>true</c> and the compiled script attached.</returns>
     public static ScriptCompilationResult Succeeded(Script<object?> script) =>
         new(true, script, []);
 
     /// <summary>Creates a failed compilation result.</summary>
     /// <param name="errors">List of error messages.</param>
+    /// <returns>A <see cref="ScriptCompilationResult"/> with <see cref="IsSuccess"/> set to <c>false</c> and the provided error messages.</returns>
     public static ScriptCompilationResult Failed(IReadOnlyList<string> errors) =>
         new(false, null, errors);
 }