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.Server/Diagnostics/AuthStoreHealthCheck.cs

@@ -12,9 +12,15 @@ public sealed class AuthStoreHealthCheck : IHealthCheck
 {
     private readonly AuthSqliteConnectionFactory _connectionFactory;
 
+    /// <summary>Initializes a new instance of the <see cref="AuthStoreHealthCheck"/> class.</summary>
+    /// <param name="connectionFactory">Factory used to open connections to the SQLite auth store.</param>
     public AuthStoreHealthCheck(AuthSqliteConnectionFactory connectionFactory) =>
         _connectionFactory = connectionFactory ?? throw new ArgumentNullException(nameof(connectionFactory));
 
+    /// <summary>Verifies the SQLite auth store is reachable by executing a trivial query.</summary>
+    /// <param name="context">The health check context.</param>
+    /// <param name="cancellationToken">Token to cancel the asynchronous operation.</param>
+    /// <returns>Healthy when the store responds; otherwise Unhealthy with the underlying exception.</returns>
     public async Task<HealthCheckResult> CheckHealthAsync(
         HealthCheckContext context,
         CancellationToken cancellationToken = default)