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/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.Cli.Common/DriverCommandBase.cs

@@ -41,6 +41,9 @@ public abstract class DriverCommandBase : ICommand
     /// </summary>
     public abstract TimeSpan Timeout { get; init; }
 
+    /// <summary>Executes the command with the given console output.</summary>
+    /// <param name="console">The console for output.</param>
+    /// <returns>A task that completes when the command is finished.</returns>
     public abstract ValueTask ExecuteAsync(IConsole console);
 
     /// <summary>

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.Cli.Common/SnapshotFormatter.cs

@@ -21,6 +21,8 @@ public static class SnapshotFormatter
     ///     Server Time: 2026-04-21T12:34:56.790Z
     ///     </code>
     /// </summary>
+    /// <param name="tagName">The tag name to include in the output.</param>
+    /// <param name="snapshot">The data value snapshot to format.</param>
     public static string Format(string tagName, DataValueSnapshot snapshot)
     {
         ArgumentNullException.ThrowIfNull(snapshot);
@@ -38,6 +40,8 @@ public static class SnapshotFormatter
     /// <summary>
     ///     Write-result render, one line: <c>Write &lt;tag&gt;: 0x... (Good|...)</c>.
     /// </summary>
+    /// <param name="tagName">The tag name to include in the output.</param>
+    /// <param name="result">The write result to format.</param>
     public static string FormatWrite(string tagName, WriteResult result)
     {
         ArgumentNullException.ThrowIfNull(result);
@@ -48,6 +52,8 @@ public static class SnapshotFormatter
     ///     Table-style render for batch reads. Emits an aligned 4-column layout:
     ///     tag / value / status / source-time.
     /// </summary>
+    /// <param name="tagNames">The list of tag names to include as rows.</param>
+    /// <param name="snapshots">The list of data value snapshots to format.</param>
     public static string FormatTable(
         IReadOnlyList<string> tagNames, IReadOnlyList<DataValueSnapshot> snapshots)
     {
@@ -92,6 +98,9 @@ public static class SnapshotFormatter
         return sb.ToString().TrimEnd();
     }
 
+    /// <summary>Formats a value for console output, handling null, bool, string, and formattable types.</summary>
+    /// <param name="value">The value to format.</param>
+    /// <returns>A formatted string representation of the value.</returns>
     public static string FormatValue(object? value) => value switch
     {
         null => "<null>",
@@ -101,6 +110,9 @@ public static class SnapshotFormatter
         _ => value.ToString() ?? "<null>",
     };
 
+    /// <summary>Formats an OPC UA status code as a hexadecimal string with named severity classification.</summary>
+    /// <param name="statusCode">The OPC UA status code to format.</param>
+    /// <returns>A formatted status string like "0x00000000 (Good)" or "0x80050000 (BadCommunicationError)".</returns>
     public static string FormatStatus(uint statusCode)
     {
         // OPC UA status codes carry sub-code and flag bits in the low 16 bits (info type,
@@ -149,6 +161,9 @@ public static class SnapshotFormatter
             : $"0x{statusCode:X8} ({name})";
     }
 
+    /// <summary>Formats a UTC timestamp as an ISO 8601 string, or "-" if null.</summary>
+    /// <param name="ts">The timestamp to format, or null.</param>
+    /// <returns>An ISO 8601 formatted string or "-".</returns>
     public static string FormatTimestamp(DateTime? ts)
     {
         if (ts is null) return "-";