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/SharedScriptLibrary.cs

@@ -36,6 +36,7 @@ public class SharedScriptLibrary
     /// </summary>
     /// <param name="name">Unique name for the shared script.</param>
     /// <param name="code">C# source code of the shared script.</param>
+    /// <returns><c>true</c> if compilation succeeded and the script was registered; <c>false</c> if compilation failed.</returns>
     public bool CompileAndRegister(string name, string code)
     {
         var result = _compilationService.Compile(name, code);
@@ -60,6 +61,7 @@ public class SharedScriptLibrary
     /// Removes a shared script from the library.
     /// </summary>
     /// <param name="name">Name of the shared script to remove.</param>
+    /// <returns><c>true</c> if the script was found and removed; <c>false</c> if no script with that name was registered.</returns>
     public bool Remove(string name)
     {
         lock (_lock)
@@ -76,6 +78,7 @@ public class SharedScriptLibrary
     /// <param name="context">Runtime context providing instance state and services to the script globals.</param>
     /// <param name="parameters">Optional input parameters passed to the script.</param>
     /// <param name="cancellationToken">Cancellation token for the execution.</param>
+    /// <returns>A task that resolves to the script's return value, or <c>null</c> if the script returns nothing.</returns>
     public async Task<object?> ExecuteAsync(
         string scriptName,
         ScriptRuntimeContext context,
@@ -106,6 +109,7 @@ public class SharedScriptLibrary
     /// <summary>
     /// Returns the names of all currently registered shared scripts.
     /// </summary>
+    /// <returns>A snapshot list of all registered script names at the time of the call.</returns>
     public IReadOnlyList<string> GetRegisteredScriptNames()
     {
         lock (_lock)
@@ -118,6 +122,7 @@ public class SharedScriptLibrary
     /// Returns whether a script with the given name is registered.
     /// </summary>
     /// <param name="name">Name of the shared script to look up.</param>
+    /// <returns><c>true</c> if a script with the given name is registered; otherwise <c>false</c>.</returns>
     public bool Contains(string name)
     {
         lock (_lock)