docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

src/ZB.MOM.WW.MxGateway.Tests/Gateway/Grpc/GalaxyRepositoryHostWiringTests.cs

@@ -29,6 +29,7 @@ public sealed class GalaxyRepositoryHostWiringTests
     ///     <see cref="GatewayBrowseScopeProvider"/> threads the constraint into the lib
     ///     service → <c>BrowseChildren</c> returns empty children.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task BrowseChildren_BrowseSubtreesConstraintThroughHostWiring_FiltersChildren()
     {
@@ -130,13 +131,17 @@ public sealed class GalaxyRepositoryHostWiringTests
     /// <summary>Immediately-ready stub: Current returns the seeded entry, loads are instant.</summary>
     private sealed class StubGalaxyHierarchyCache(GalaxyHierarchyCacheEntry current) : IGalaxyHierarchyCache
     {
-        /// <inheritdoc />
+        /// <summary>Gets the seeded cache entry passed to the stub's constructor.</summary>
         public GalaxyHierarchyCacheEntry Current { get; } = current;
 
-        /// <inheritdoc />
+        /// <summary>No-op: the stub's entry is always considered already loaded.</summary>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>A task that represents the asynchronous operation.</returns>
         public Task RefreshAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 
-        /// <inheritdoc />
+        /// <summary>No-op: the stub's entry is always considered already loaded.</summary>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>A task that represents the asynchronous operation.</returns>
         public Task WaitForFirstLoadAsync(CancellationToken cancellationToken) => Task.CompletedTask;
     }
 
@@ -146,23 +151,33 @@ public sealed class GalaxyRepositoryHostWiringTests
     /// </summary>
     private sealed class StubGalaxyRepository : IGalaxyRepository
     {
-        /// <inheritdoc />
+        /// <summary>Always throws: <c>BrowseChildren</c> never calls the repository directly.</summary>
+        /// <param name="ct">Cancellation token.</param>
+        /// <returns>Never returns; always throws.</returns>
         public Task<bool> TestConnectionAsync(CancellationToken ct = default) =>
             throw new NotSupportedException("Not called during BrowseChildren.");
 
-        /// <inheritdoc />
+        /// <summary>Always throws: <c>BrowseChildren</c> never calls the repository directly.</summary>
+        /// <param name="ct">Cancellation token.</param>
+        /// <returns>Never returns; always throws.</returns>
         public Task<DateTime?> GetLastDeployTimeAsync(CancellationToken ct = default) =>
             throw new NotSupportedException("Not called during BrowseChildren.");
 
-        /// <inheritdoc />
+        /// <summary>Always throws: <c>BrowseChildren</c> never calls the repository directly.</summary>
+        /// <param name="ct">Cancellation token.</param>
+        /// <returns>Never returns; always throws.</returns>
         public Task<List<GalaxyHierarchyRow>> GetHierarchyAsync(CancellationToken ct = default) =>
             throw new NotSupportedException("Not called during BrowseChildren.");
 
-        /// <inheritdoc />
+        /// <summary>Always throws: <c>BrowseChildren</c> never calls the repository directly.</summary>
+        /// <param name="ct">Cancellation token.</param>
+        /// <returns>Never returns; always throws.</returns>
         public Task<List<GalaxyAttributeRow>> GetAttributesAsync(CancellationToken ct = default) =>
             throw new NotSupportedException("Not called during BrowseChildren.");
 
-        /// <inheritdoc />
+        /// <summary>Always throws: <c>BrowseChildren</c> never calls the repository directly.</summary>
+        /// <param name="ct">Cancellation token.</param>
+        /// <returns>Never returns; always throws.</returns>
         public Task<List<GalaxyAlarmAttributeRow>> GetAlarmAttributesAsync(CancellationToken ct = default) =>
             throw new NotSupportedException("Not called during BrowseChildren.");
     }