docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/AdminOperations/ConfigComposer.cs

@@ -22,6 +22,9 @@ public static class ConfigComposer
         DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.Never,
     };
 
+    /// <summary>Reads the current configuration and returns a deterministic snapshot blob with revision hash.</summary>
+    /// <param name="db">The configuration database context.</param>
+    /// <param name="ct">The cancellation token for the operation.</param>
     public static async Task<ConfigArtifact> SnapshotAndFlattenAsync(
         OtOpcUaConfigDbContext db, CancellationToken ct = default)
     {
@@ -49,6 +52,7 @@ public static class ConfigComposer
     }
 
     /// <summary>Returns the SHA-256 hex digest of the supplied artifact bytes (lowercase, no prefix).</summary>
+    /// <param name="blob">The bytes to hash.</param>
     public static string HashOf(ReadOnlySpan<byte> blob) =>
         Convert.ToHexStringLower(SHA256.HashData(blob));
 }